I can see their tummies move when I feed them, is that normal?
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Ok....while they are digesting there will be visible movement from two areas. At the base of the crop are muscles....these muscles will churn the food to deliver it into the proventriculus which is the opening to the digestive tract. OK, just below the ribs is a hard muscle, is the ventriculus, aka:gizzard , which further grinds and processes the food before it enters the intestines. It is the gizzard that gives the chick the bottom heavy look as the muscle developes and gets larger. As the baby gets older and grows into it's shape this muscle is smaller and less noticable.