Low birth weight infants are host to numerous microorganisms immediately after birth, and the microbiomes of their mouths and gut start out very similar but differentiate significantly by day 15 according to a study published in mBio®, the online open-access journal of the American Society for Microbiology.
To access to full article: Microbiome in gut, mouth, and skin of low birth weight infants differentiate weeks after birth (Image from http://www.dailymarion.com/2011/03/21/preemies-in-texas-a-collision-of-ideologies/)
Skin Microbiome 