Upper cervical chiropractic has been shown many times over to help a child get back on track with developmental milestones. When there is a slight misalignment of the top bones of the neck, it directly interferes with communication between the brain - which is trying to tell the muscles to behave, tone up and balance out - and the body below. I have seen many children heal and get stronger with upper cervical chiropractic. Now, your question about risks is important to address. The biggest risk is that the misalignment doesn't get fully corrected. Then the child won't respond the way we want. For that reason, you will want to select an upper cervical chiropractor who uses a procedure that both defines the goal for the correction and verifies that it was achieved. Three upper cervical procedures follow that plan: NUCCA (National Upper Cervical Chiropractic Association), Orthospinology (orthospinology.org), and Atlas Orthogonal. The first two have a website that can locate a doctor for you, the third you have to hunt.
Best of luck,
Dr. Philip R. Schalow