Can chiropractors help with reflux?

In Kids--No. This does not work for infants or children. Do not waste your time or money.
Not likely. Reflux is due to incompetence or dysfunction of the junctional blockage between the stomach and the esophagus. This is an autonomic function not under voluntary control. There is no evidence, even in the bizarre theories of chiropractors, that a deep spinal massage can do anything about reflux. For this problem you should consult your gastroenterologist.
Offer moral support. Chiropractors can help by talking with reflux patients and offering moral support as patients try to eat the proper anti-reflux low-acid diet, as they try to lose weight (especially tummy fat), and as they try to not snack after dinner. The actual chiropractic manipulations done at chiropractic clinics don't change reflux.