There are countless such anecdotes, but rarely anything scientifically reproducible.

These are called coincidences. If you take the baby to the chiropractor and the baby suddenly gets well, of course you're going to talk about it! That doesn't mean that the chiropractor had anything to do with it. What's the chiropractor's success/failure ratio?

Also, the idea of a "baby chiropractor" squicks me out. Maybe this one only lightly touched the baby, but I've heard horror stories about them harming babies. People think "Oh, the worst that can happen is that nothing changes." No, the chiropractor can make things worse.