S.C.
Hi A.,
I occasionally go to the chiropractor, but I haven't had the chiropractor care for my baby at all. I think that there has been some research relating to SIDS and babies whose spine wasn't aligned. A friend of mine used to bring her daughter and she said that the chiro would squeeze the baby's butt cheeks and as long as her butt crack was straight, then her back was aligned correctly.
If you feel uncomfortable, ask your chiro why he feels the need to treat your son, and what exactly he would be doing. I can't imagine that he would do an actual adjustment on an infant... you know your baby best - trust your gut. Best of luck to you!