Most likely, yes, it's the chick equivalent of the umbilicus. Usually it will pull itself away once it gets mobile and starts moving around. Each chick is different and some are more active sooner than others. Some chicks are stronger at hatch, better hydrated or have easier hatches. Some need longer rest periods, may not have been as ready as it should, there's always the possibility of dehydration.
When to move them to the brooder is a personal decision. I move mine as they hatch and become active. Some people wait until they are mostly dry and fluffy and some won't move them until the end, after everyone has hatched. My personal belief is they should be where they can drink/eat if they so choose within 12 hours. I provide electrolyte infused water and crumble for them as soon as they go in the brooder. The experts tell you to carefully dip the tip of their beak in the water dish when you introduce them to the brooder to give them a sense of where the water is. Some chicks will be drinking and eating in a matter of hours while others you may not see actually pecking the food for a day or so. The hands off hatchers that leave their chicks in the bator 2-3 days go off the theory that the absorbed yolk will feed and sustain them for the first 3 days so they needn't eat/drink. (I'll spare you my thoughhts.
Glad to hear it's going good.They have found their food. Very happy. Thanks so much for all your help.
