Normal flora

[Jay Mone']

The normal flora is begins to be established at the time of birth.  
The first intestinal bacteria to be established is usually 
lactobacilli acquired from the vaginal tract of the mother.  Other 
bacteria are acquired by direct contact with the mother (such as 
through breast feeding), and by foods and fomites.  Of course, these 
bacteria provide little protection from pathogens for several months.  
The more important mechanism of protection of the neonate and infant 
is from maternal antibodies acquired in utero.

Jay Mone'