It's
currently a challenge to do this kind of microbial redesign —
antibiotics reduce microbial burden but fail to induce major changes in bacterial composition, and from fecal transplant studies in the gut we
know that bacterial populations return to a baseline population even after a major shift — so more work is needed to attempt a durable change in the vaginal microbiome.
If you
know your child's digestive flora is likely to be compromised — for example if the child is
currently taking or has recently undertaken a course of
antibiotics - then giving probiotics is a good way of re-balancing the digestive flora.