Sorry I didn't write down where I read it but years ago I read that
flatulence was often caused by a shortage of B vitamins. Since
vit B is water soluble and not much is stored and since it is
sometimes called the 'stress vitamin' , it made sense to me.
I have  occasionally mentioned this to new moms and they
have reported that it helps, to increase their Bvit foods, not only
with their own flatulence but often with babies gassiness too.

Ruth Bacon  IBCLC  Ontario