What role does breastfeeding play in all that?
Does that help impart beneficial bacteria to the baby?
FWIW, I have been doing a lot of research into probiotics and some of the most benefical ones and came up with these interesting sources.
Histamine Lowering Probiotics for People with Mast Cell Activation Syndrome and Histamine Intolerance
https://mastcell360.com/histamine-lowering-probiotics-for-people-with-mast-cell-activation-syndrome-and-histamine-intolerance/
Benefits of the Probiotic Lactobacillus Rhamnosus GG
https://www.pursuit-of-happiness.org/benefits-of-the-probiotic-lactobacillus-rhamnosus-gg/
Saccharomyces Boulardii: The Antibiotic Resistant Probiotic
https://www.mygenefood.com/blog/saccharomyces-boulardii-antibiotic-resistant-probiotic/
Just FYI.
Babies do get some bacteria from breast milk, with l. Reuteri being identified that way, originally.