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New Research in Babies Microbiomes - Babies May Not Be Born Sterile But With Their Own Bacteria!

Updated on May 4, 2012

Babies Microbiomes

A microbiome is defined as the total amount of microbes and environmental interactions in a particular environment. Humans have a variety of different internal and external microbes that have numerous amounts of functions.

Bacterial mutual relationships are crucial for our survival and an imbalanced gut flora may lead to a number of different disorders.
A pregnant mother is riddled with her own gut flora and numerous amounts of bacteria on her skin from the external environment. According to medical science it is thought that the fetus lives in a sterile environment and that a mothers bacteria does not affect the fetus.

The flora of bacteria in the human body is extremely important as research has showed that early bacterial flora will shape our immune systems and influence out risks of disease as we get older.

New research into how a microbiome in humans initially develops has put a spin on how medics think about a fetus’s first microbiome. Evidence is now showing that babies are born with the bacteria that colonise the mother’s digestive system in the womb. Originally the first bacterial flora to colonise an infant was thought to be obtained by the mother’s vagina or the environment the infant was born into.

Information into how bacterial flora affects different systems and diseases in the body can be used to ensure a baby is given the healthiest start in life.

Esther Jimenez and her colleagues at the Complutense University of Madrid, Spain were the first to show evidence suggesting mammals may develop a microbiome before birth in the womb; published four years ago. Jimenez conducted a study using mice, in which a genetic marker was added to milk. The milk containing the labelled bacteria was then fed to eight pregnant mice.

In order to try to control as many external variables that may occur the mice had their offspring delivered by caesarean section in a sterile environment. This procedure took place one day before the mice were due to give birth. Each newborn had its first faeces (meconium) collected for examination; this is normally passed in the first few hours after a baby is born.

The meconium was found to contain the labelled bacteria, suggesting that the bacteria have transferred from the mother’s digestive system to the fetus during pregnancy. (Jimenez et al, Research in Microbiology,DOI:10.1016/j.resmic.2007.12.007)

Pilar Francino and her colleagues at the University of Valencia in Spain decided to conduct a study to see if the same effect occurred in humans. The study involved collecting and freezing the meconium of babies from 20 different women. To eliminate any external factors affecting the study the outer layer of each sample was removed. Removal of the outer layer would rule out any bacteria that may be picked after birth. The meconiums were then investigated for any bacterial DNA.

Pilar Francino et al found that the babies’ meconium contained bacteria. The bacteria found in the meconium is a big discovery but what was more impressive was how developed the bacterial communities were. The bacterial communities seemed to fall into two different categories.

  • Around half of the samples were dominated by bacteria that produced lactic acid such as lactobacillus.
  • The other half of the samples contained enteric bacteria such as Escherichia coli.

Meconium is a tar-like substance, making is extremely hard to extract DNA from although freezing the meconium makes it easier to extract DNA.

New technology and laboratorial procedures have helped the discovery of the early development of microbiomes. Previous DNA extraction techniques were not sensitive enough to pick up bacterial DNA in the meconium.

Research has showed that microboimes can influence our risk of disease therefore Francino’s team checked on the health of infants at the age’s one and four. The results showed that infants born with more lactic acid bacteria had a higher risk of developing asthma-like symptoms, those born with more enteric bacteria were at a greater risk of eczema.

A mother’s lifestyle during pregnancy has been linked to the first bacterial communities that develop in a fetus. Mothers who consumed organic foods during pregnancy promoted lactic acid bacteria where mothers who smoked seemed to encourage an enteric microbiome. These findings were displayed at the international Human Microboime Congress in Paris, France.

There have been many suggestions into how the bacteria have found their way to the fetus. It has been suggested that the bacteria most likely transfer to the fetus via the placenta. This conclusion has been derived from blood being taken from the umbilical cord previously and bacteria being found; connecting the fetus to the placenta.

The suggestion that a mothers bacteria influences a babies first microbiome may be extremely important in developing the makeup of a babies microime before its born. The first bacteria that colonise the gut are thought to influence the bacterial species that follow it.

Imbalances in microboimes has been linked to different disorders such as irritable bowel syndrome to obesity. Altered microbiomes may even have an effect on personality and autism.

James Kinross, a surgeon at Imperial College London; who researches the gut microbiome.
“My view is that the first bacteria are very likely to influence the development of an infant’s gut and immune system."

Studies can be conducted to define which bacteria are the most important early on, and which bacteria may cause implications for later health and immune disorders. Pregnant women will be able to make changes to their diets and lifestyles to promote a microbiome that will benefit the fetus.

Doctors must now take into consideration that we are born with our set of bacteria, gut flora because standard medical teaching is that the fetus is sterile. Medical teams could attempt to change the course of disorder by identifying the missing bacteria and administering probiotics to the mother during pregnancy to replace bacteria missing or low levels.

Hopefully I have shed some light on new research that may change the way we can lower risks and prevent diseases that can develop in infants as they become older.

If you find my Hub interesting don't hesitate in leaving a comment, I would really appreciate it.



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    • profile image


      9 days ago

      I gave this article a 3. The author is not a credible source with any sort of relevant credentials; he receives a 0 in this category. The motivation is pointed out at the end of the article. The author hopes to give more information about the topic of gut bacteria in infants and what that bacteria might affect for the child in the future; I gave this a 2. The sources used are sporadic with only some being really credible. More reliable sources needed to be used. I gave this section a 1.

    • profile image

      brad huff 

      7 weeks ago

      Needs better documentation of credible sources

    • profile image

      Angel Chappell 

      6 months ago

      I found the article interesting but it needed more credible sources and citations. For Authority I would rate 1/3, Motivation 2/3, and Reliability 2/3.

    • profile image

      Shaquita Taylor 

      10 months ago

      This article is very interesting but I do believe it needs more credible sources and better references. For Authority I would rate 2/3, Motivation 3/4, Reliability 3/4

    • profile image

      Zac Sturdivant 

      10 months ago

      This article is very interesting and helpful, but needs more credible sources including the author of the article and his background. Authority-3/4 Motivation-3/4 Reliability- 2/4

    • profile image

      Payton Evans 

      12 months ago

      This article is very helpful, but needs more credible sources and citations at the bottom. Also knowing who wrote this article could increase credibility

    • profile image

      Justin Shiu 

      12 months ago

      Using the scale, I would rate authority as 1/2, motivation as 2/2, and authority as 1/2. The author did a really good job informing; however, there was a lack of sources and the site is not a recognized authority.

    • profile image

      Jasmine Chavez 

      12 months ago

      I believe the author could use more credentials and more reliable sources. Overall i would give this blog a

      Authority- 3/4



    • profile image


      13 months ago

      I gave this a rating of 3 I think the author needs more credible sources and needs to cite references clearly.

    • profile image

      Dayna Kraklio 

      13 months ago

      I would give the article a 4 because only some of the sources were credible and the author has no credible knowledge in the field

    • profile image


      14 months ago

      I would give score of 4.Author should add his name and update info.

    • profile image


      15 months ago

      I would give the article a 4. I think the author should have more reliable credentials.

    • profile image


      15 months ago

      Authority: 1/2

      Motivation: 2/2

      Reliability: 1/2

      Total: 4/6

    • profile image


      20 months ago

      I will give it 4 and I believe the author should have more reliable credentials

    • profile image

      Exxon Valdez 

      21 months ago

      Small studies like these sometimes reflect an interesting or novel finding about our world. I learned a thing or two from the essay and would be interested in what follow-up work shows.

      I fail to see grounds for the claim that mother's ingestion of organic good vs conventionally grown foods can predispose her child's gut flora without controlling for so may other variables. For example, do those who have the will and resourced to purchase organic foods also tend to eat more home cooked meals and less Wendy's and Taco Bell drive-thrus.

    • profile image

      Stephanie Gene 

      21 months ago

      I did not give this site a very high rating mostly because I believe the author needs more credible sources. If I has decided to use this website in a research paper I would have trouble citing the information because although the author did cite other resources, there is not much information besides. I'd also like to see statistics or more information from widely recognized names in medicine and science.

    • profile image

      Shannon Briggs 

      2 years ago

      I gave this a rating of 4 I think the author needs more credible sources.

    • profile image


      2 years ago

      i will give this site a rating of 4. to make this site better, there should be relevant or reliable credentials

    • profile image

      Joan Elder 

      4 years ago

      Just wondering if a water birth might cause the natural bacteria in the mothers vagina to be washed away, thereby not providing that natural innoculation to the birthing fetus. What do you think? Is there any evidence or research on this?

    • profile image


      4 years ago

      I'm wondering if you could give links to these articles. Thanks!

    • inaniLoquence profile image


      6 years ago from Singapore

      Thank you for sharing this hub! I found it really interesting. Voted up, useful and interesting. Will also be sharing it to my followers. :)


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