Baby’s first bacteria arrive sooner than we thought

For more than a century, scientists have assumed that babies come into the world germ-free after nine months in a sterile womb. Not so, new studies find: Bacteria lurk in the placenta, amniotic fluid and umbilical cord blood, making the womb a germy place.


This article is only available to Science News subscribers.

Subscribers, enter your e-mail address to access our archives.

Not a subscriber?

Science News is a nonprofit.

Support us by subscribing now.

More Stories from Science News on Health & Medicine

From the Nature Index

Paid Content