{"id":976,"date":"2026-01-07T06:30:00","date_gmt":"2026-01-07T06:30:00","guid":{"rendered":"https:\/\/jessicafonteneaunutrition.com\/?p=976"},"modified":"2026-02-18T08:14:42","modified_gmt":"2026-02-18T08:14:42","slug":"microbiome-testing-and-infant-eczema-does-it-actually-help","status":"publish","type":"post","link":"https:\/\/jessicafonteneaunutrition.com\/fr\/microbiome-testing-and-infant-eczema-does-it-actually-help\/","title":{"rendered":"Analyse du microbiome et ecz\u00e9ma du nourrisson : Est-ce que cela aide vraiment ?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Lorsque votre b\u00e9b\u00e9 souffre d'ecz\u00e9ma, il est naturel de chercher des r\u00e9ponses partout. De nombreux parents d\u00e9couvrent rapidement les recherches de plus en plus nombreuses qui montrent l'influence du microbiome intestinal sur le d\u00e9veloppement immunitaire pr\u00e9coce et la sant\u00e9 de la peau. \u00c0 partir de l\u00e0, les publicit\u00e9s en ligne pour les tests de microbiome infantile peuvent \u00eatre tentantes. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L'id\u00e9e qu'un test de selles puisse d\u00e9couvrir la cause d'une pouss\u00e9e est naturellement s\u00e9duisante. Comme j'utilise les tests de selles avec des enfants plus \u00e2g\u00e9s et des adultes, je sais \u00e0 quel point ils peuvent \u00eatre utiles une fois que le microbiome est mieux \u00e9tabli. Cependant, aucun des laboratoires r\u00e9put\u00e9s que j'utilise ne propose de tests du microbiome pour les nourrissons de moins de deux ans. Il y a une tr\u00e8s bonne raison \u00e0 cela : le microbiome d'un b\u00e9b\u00e9 est encore en d\u00e9veloppement et les r\u00e9sultats n'offrent tout simplement pas la clart\u00e9 que les parents esp\u00e8rent.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Pourquoi les parents envisagent-ils de tester le microbiome en cas d'ecz\u00e9ma du nourrisson ?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsqu'un enfant est mal \u00e0 l'aise ou <a href=\"https:\/\/jessicafonteneaunutrition.com\/fr\/what-is-the-atopic-march-and-does-it-mean-your-childs-eczema-will-get-worse\/\" title=\"\"><strong>r\u00e9agir de mani\u00e8re impr\u00e9visible<\/strong><\/a>, Les parents veulent des conseils clairs. Il est tout \u00e0 fait compr\u00e9hensible d'esp\u00e9rer qu'un test du microbiome puisse identifier un d\u00e9s\u00e9quilibre ou r\u00e9v\u00e9ler un d\u00e9clencheur cach\u00e9. La sant\u00e9 intestinale est \u00e9troitement li\u00e9e \u00e0 l'inflammation et l'ecz\u00e9ma est souvent per\u00e7u comme une affection ayant des racines plus profondes. Pourtant, le d\u00e9fi que pose le test du microbiome pour un b\u00e9b\u00e9 n'est pas que l'intestin n'est pas pertinent, mais que le microbiome ne s'est pas encore install\u00e9 dans un sch\u00e9ma significatif \u00e0 interpr\u00e9ter. La science du d\u00e9veloppement pr\u00e9coce de l'intestin montre pourquoi cela est important.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Comment se d\u00e9veloppe le microbiome du nourrisson<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Le microbiome intestinal des adultes est relativement stable, ce qui n'est pas le cas de celui des b\u00e9b\u00e9s. Il s'agit au contraire d'un \u00e9cosyst\u00e8me en \u00e9volution rapide et en constante mutation. Au cours des premiers mois de la vie, les microbes provenant de la naissance, du contact avec la peau, du lait maternel, du lait maternis\u00e9 et de l'environnement commencent \u00e0 coloniser l'intestin. Ce stade pr\u00e9coce est dynamique et facilement influen\u00e7able. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La recherche montre que plusieurs facteurs fa\u00e7onnent ce microbiome pr\u00e9coce : le mode de naissance, les choix d'alimentation, les antibiotiques, les infections et le moment o\u00f9 les premiers aliments sont consomm\u00e9s. Une vaste \u00e9tude de cohorte europ\u00e9enne, qui a suivi des enfants de la naissance \u00e0 l'\u00e2ge de cinq ans, a r\u00e9v\u00e9l\u00e9 que les bifidobact\u00e9ries dominent souvent au d\u00e9but, en particulier chez les b\u00e9b\u00e9s nourris au sein\u00b9\u00b2. Plus tard, avec l'introduction des aliments solides, d'autres bact\u00e9ries s'installent progressivement. Cependant, la chronologie de ces changements varie consid\u00e9rablement d'un enfant \u00e0 l'autre. En raison de ces variations, deux nourrissons en bonne sant\u00e9 peuvent avoir des profils microbiens compl\u00e8tement diff\u00e9rents. Il n'existe pas de marqueur unique d\u00e9finissant un microbiome infantile \u201cnormal\u201d.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Pourquoi la variation rend difficile l'analyse du microbiome<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cette variabilit\u00e9 naturelle signifie qu'un test de selles ne peut pas d\u00e9terminer de mani\u00e8re significative si l'intestin d'un b\u00e9b\u00e9 est \u00e9quilibr\u00e9 ou d\u00e9s\u00e9quilibr\u00e9. Les r\u00e9sultats d'un enfant peuvent \u00eatre compl\u00e8tement diff\u00e9rents de ceux d'un autre, alors que les deux se d\u00e9veloppent tout \u00e0 fait normalement. Un seul \u00e9chantillon ne saisit qu'un moment dans le temps, et non la trajectoire globale du d\u00e9veloppement. C'est pourquoi l'analyse du microbiome pour l'ecz\u00e9ma du b\u00e9b\u00e9 n'offre pas les m\u00eames informations que pour les enfants plus \u00e2g\u00e9s.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Ce que la recherche r\u00e9v\u00e8le sur le microbiome et l'ecz\u00e9ma<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La relation entre les bact\u00e9ries intestinales et l'ecz\u00e9ma est \u00e9tudi\u00e9e depuis des d\u00e9cennies. Plusieurs \u00e9tudes de grande envergure ont mis en \u00e9vidence des sch\u00e9mas qui apparaissent plus fr\u00e9quemment chez les b\u00e9b\u00e9s qui d\u00e9veloppent plus tard de l'ecz\u00e9ma. Par exemple, la cohorte de naissance KOALA a montr\u00e9 que les nourrissons d'un mois ayant un taux de bact\u00e9ries intestinales plus \u00e9lev\u00e9 \u00e9taient plus susceptibles d'\u00eatre atteints d'ecz\u00e9ma.&nbsp;<em>Clostridium difficile<\/em>&nbsp;\u00e9taient plus susceptibles de d\u00e9velopper un ecz\u00e9ma\u00b3. Augmentation&nbsp;<em>Escherichia coli<\/em>&nbsp;\u00e9tait \u00e9galement li\u00e9 \u00e0 un risque plus \u00e9lev\u00e9. Une autre \u00e9tude men\u00e9e en Su\u00e8de et en Estonie a r\u00e9v\u00e9l\u00e9 que les b\u00e9b\u00e9s qui finissaient par d\u00e9velopper un ecz\u00e9ma ou des allergies avaient souvent moins de bifidobact\u00e9ries et plus de clostridia\u2074. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Des \u00e9tudes plus r\u00e9centes bas\u00e9es sur l'ADN sugg\u00e8rent des tendances similaires. Certaines font \u00e9tat d'une plus faible diversit\u00e9 du microbiome\u2076 et d'autres notent des signatures microbiennes distinctes chez les nourrissons atteints de dermatite atopique\u2075. Si ces r\u00e9sultats nous aident \u00e0 comprendre comment l'intestin et le syst\u00e8me immunitaire interagissent, ils ne nous donnent pas un \u201cmicrobiome de l'ecz\u00e9ma\u201d unique. Deux b\u00e9b\u00e9s atteints d'ecz\u00e9ma peuvent avoir des profils microbiens totalement diff\u00e9rents, et de nombreux b\u00e9b\u00e9s ayant des microbiomes typiques d\u00e9veloppent malgr\u00e9 tout l'affection.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"563\" src=\"https:\/\/jessicafonteneaunutrition.com\/wp-content\/uploads\/2025\/12\/Microbiome-Testing-and-Infant-Eczema-Does-It-Actually-Help-1.jpg\" alt=\"microbiome testing baby eczema - image of microbiome\" class=\"wp-image-996\" srcset=\"https:\/\/jessicafonteneaunutrition.com\/wp-content\/uploads\/2025\/12\/Microbiome-Testing-and-Infant-Eczema-Does-It-Actually-Help-1.jpg 1000w, https:\/\/jessicafonteneaunutrition.com\/wp-content\/uploads\/2025\/12\/Microbiome-Testing-and-Infant-Eczema-Does-It-Actually-Help-1-980x552.jpg 980w, https:\/\/jessicafonteneaunutrition.com\/wp-content\/uploads\/2025\/12\/Microbiome-Testing-and-Infant-Eczema-Does-It-Actually-Help-1-480x270.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1000px, 100vw\" \/><\/figure>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Test du microbiome pour l'ecz\u00e9ma du b\u00e9b\u00e9 : pourquoi il n'apporte pas de r\u00e9ponses claires<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Comme j'utilise souvent l'analyse des selles chez les enfants plus \u00e2g\u00e9s, j'en appr\u00e9cie la valeur. Cependant, les laboratoires r\u00e9put\u00e9s ne testent pas les nourrissons de moins de deux ans pour plusieurs raisons essentielles.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Le microbiome du nourrisson change trop rapidement<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Chez les b\u00e9b\u00e9s, les sch\u00e9mas microbiens peuvent changer en quelques jours. Un nouvel aliment, une maladie b\u00e9nigne ou des antibiotiques peuvent modifier l'\u00e9quilibre de mani\u00e8re significative. Un \u00e9chantillon de selles pr\u00e9lev\u00e9 aujourd'hui peut \u00eatre tr\u00e8s diff\u00e9rent la semaine prochaine. Cette instabilit\u00e9 rend l'interpr\u00e9tation peu fiable.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Il n'existe pas d'intervalle de r\u00e9f\u00e9rence \u00e9tabli pour les b\u00e9b\u00e9s<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Contrairement aux adultes, les b\u00e9b\u00e9s n'ont pas de normes convenues sur ce \u00e0 quoi doit ressembler un microbiome sain. Les nourrissons en bonne sant\u00e9 pr\u00e9sentent d'\u00e9normes variations naturelles\u00b9\u00b2. En l'absence de plages de r\u00e9f\u00e9rence, les r\u00e9sultats des tests ne peuvent \u00eatre interpr\u00e9t\u00e9s avec confiance.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Les r\u00e9sultats de la recherche ne peuvent pas \u00eatre appliqu\u00e9s \u00e0 des b\u00e9b\u00e9s individuels<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bien que les premi\u00e8res \u00e9tudes montrent des associations\u00b3\u2074\u2075\u2076, elles ne d\u00e9montrent pas que le changement de bact\u00e9ries sp\u00e9cifiques am\u00e9liore l'ecz\u00e9ma. Nous manquons \u00e9galement de moyens \u00e9prouv\u00e9s et cibl\u00e9s pour modifier le microbiome du nourrisson de mani\u00e8re s\u00fbre et pr\u00e9visible.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Les r\u00e9sultats des tests modifient rarement les conseils<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les parents esp\u00e8rent souvent que les tests du microbiome permettront de d\u00e9couvrir les aliments d\u00e9clencheurs ou la cause profonde des pouss\u00e9es. En r\u00e9alit\u00e9, les recommandations restent globalement les m\u00eames : favoriser une alimentation adapt\u00e9e \u00e0 l'\u00e2ge, \u00e9viter les antibiotiques inutiles, introduire des aliments vari\u00e9s lorsque l'enfant est pr\u00eat \u00e0 se d\u00e9velopper et maintenir des soins cutan\u00e9s coh\u00e9rents. Le test ne permet pas de personnaliser le traitement de l'ecz\u00e9ma chez un b\u00e9b\u00e9, car le microbiome n'est pas encore suffisamment stable pour donner des indications significatives.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>L'instinct compte toujours, m\u00eame sans test<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cela ne veut pas dire que l'intestin n'est pas important. Le d\u00e9veloppement pr\u00e9coce de l'intestin joue un r\u00f4le important dans la fonction immunitaire \u00e0 long terme, la tol\u00e9rance et la sant\u00e9 de la peau. Le soutien du microbiome commence naturellement, par des habitudes quotidiennes, et non par des tests.<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Ce qui favorise le microbiome d'un b\u00e9b\u00e9 sans test<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Plusieurs gestes simples permettent de nourrir l'intestin en d\u00e9veloppement et de prot\u00e9ger la peau.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>L'allaitement maternel dans la mesure du possible<\/strong> - Le lait maternel favorise l'apparition de bact\u00e9ries pr\u00e9coces b\u00e9n\u00e9fiques et guide le d\u00e9veloppement immunitaire.<\/li>\n\n\n\n<li><strong>Introduction des aliments solides vers l'\u00e2ge de six mois<\/strong> - Le fait de proposer des l\u00e9gumes, des fruits, des c\u00e9r\u00e9ales et des prot\u00e9ines favorise progressivement la diversit\u00e9 microbienne.<\/li>\n\n\n\n<li><strong>\u00c9viter les antibiotiques inutiles<\/strong> - Bien qu'ils soient parfois indispensables, moins de cours permettent de pr\u00e9server la stabilit\u00e9 microbienne.<\/li>\n\n\n\n<li><strong>Soins constants de la barri\u00e8re cutan\u00e9e<\/strong> - une routine \u00e9molliente r\u00e9guli\u00e8re et une sensibilisation aux irritants favorisent la prise en charge de l'ecz\u00e9ma.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"563\" src=\"https:\/\/jessicafonteneaunutrition.com\/wp-content\/uploads\/2025\/12\/Microbiome-Testing-and-Infant-Eczema-Does-It-Actually-Help-2.jpg\" alt=\"microbiome testing baby eczema - baby breastfeeding\" class=\"wp-image-997\" srcset=\"https:\/\/jessicafonteneaunutrition.com\/wp-content\/uploads\/2025\/12\/Microbiome-Testing-and-Infant-Eczema-Does-It-Actually-Help-2.jpg 1000w, https:\/\/jessicafonteneaunutrition.com\/wp-content\/uploads\/2025\/12\/Microbiome-Testing-and-Infant-Eczema-Does-It-Actually-Help-2-980x552.jpg 980w, https:\/\/jessicafonteneaunutrition.com\/wp-content\/uploads\/2025\/12\/Microbiome-Testing-and-Infant-Eczema-Does-It-Actually-Help-2-480x270.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1000px, 100vw\" \/><\/figure>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Une confrontation sereine avec la r\u00e9alit\u00e9 pour les parents<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Si vous avez envisag\u00e9 d'effectuer des tests sur le microbiome, c'est tout simplement parce que vous essayez de comprendre l'ecz\u00e9ma de votre enfant. Cet instinct est valable et tout \u00e0 fait raisonnable. La science \u00e9volue rapidement et votre int\u00e9r\u00eat pour l'intestin est justifi\u00e9. Le probl\u00e8me, c'est le choix du moment. Avant l'\u00e2ge de deux ans, le microbiome du nourrisson est encore en train de trouver ses marques. Un test de selles ne peut pas encore fournir d'informations personnalis\u00e9es. Une fois le microbiome mieux \u00e9tabli, les tests deviennent beaucoup plus utiles, et je les utilise r\u00e9guli\u00e8rement chez les enfants plus \u00e2g\u00e9s. D'ici l\u00e0, l'approche la plus efficace consiste \u00e0 soutenir le d\u00e9veloppement plut\u00f4t qu'\u00e0 l'analyser.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Le bilan<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Le microbiome est important. Son lien avec l'ecz\u00e9ma est r\u00e9el. Cependant, les tests de microbiome pour les b\u00e9b\u00e9s de moins de deux ans ne peuvent pas encore apporter les r\u00e9ponses que les parents esp\u00e8rent. Le microbiome pr\u00e9coce est encore en formation, et le nourrir par l'alimentation, l'exposition et les habitudes quotidiennes offre bien plus d'avantages que les tests ne peuvent en apporter \u00e0 ce stade. Vous ne manquez rien en attendant. Vous suivez simplement le m\u00eame raisonnement que les laboratoires r\u00e9put\u00e9s : le d\u00e9veloppement pr\u00e9coce est une question de soins, pas de mesures.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>R\u00e9f\u00e9rences <\/strong><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Koenig JE, Spor A, Scalfone N, et al. Succession of microbial consortia in the developing infant gut microbiome. PNAS. 2011;108(Suppl 1):4578-85.<\/li>\n\n\n\n<li>Stewart CJ, Ajayi O, Wong E, et al. Temporal development of the gut microbiome in early childhood. Microbiome. 2018;6:144.<\/li>\n\n\n\n<li>Penders J, Thijs C, van den Brandt PA, et al. Gut microbiota composition and eczema : the KOALA Birth Cohort Study. Clin Exp Allergy. 2007;37(12):1848-56.<\/li>\n\n\n\n<li>Bj\u00f6rkst\u00e9n B, Sepp E, Julge K, et al. Allergic disease development and microbial exposure in infancy. Clin Exp Allergy. 2001;31(10):1548-53.<\/li>\n\n\n\n<li>Kim H, Jeong S, Choi J, et al. Altered gut microbiota and immunological characteristics in infants with atopic dermatitis. J Allergy Clin Immunol. 2020;146(1):321-4.<\/li>\n\n\n\n<li>Ismail IH, Oppedisano F, Joseph SJ, et al. La diversit\u00e9 microbienne intestinale r\u00e9duite au d\u00e9but de la vie est associ\u00e9e \u00e0 l'ecz\u00e9ma infantile. Pediatr Allergy Immunol. 2012;23(6):674-81.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>Vous vous demandez si le test du microbiome peut expliquer l'ecz\u00e9ma de votre b\u00e9b\u00e9 ? D\u00e9couvrez ce que la science montre, pourquoi les r\u00e9sultats varient chez les nourrissons et ce qui aide vraiment les moins de deux ans.<\/p>","protected":false},"author":4,"featured_media":998,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[11,16,17],"tags":[],"class_list":["post-976","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-children-infants","category-dermatitis","category-eczema"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Wondering if microbiome testing can explain your baby\u2019s eczema? 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