HEChicken - glad you got the babies moved and found the one that dropped out from under mom. When I move a hen with chicks under her, I spread her wings out as I pick her up so any chicks will drop before we get away from the nest. That happens a lot. I think they just press up against her so they are not held in place except by their standing on tip toes. Sometimes a chick will get caught in the hens feathers also, especially if the hen has fluffy feathers or feathered feet. Then the chick can get lost or stomped on or whatever. One cochin hen never seemed to realize what the problem was and her stomping around put the chick in more danger.