still not standing long but it loves laying in my hand lol
and it seems to have a white cord that was wraped around a wind and attached to back fluff
That'll be where it was attached to the egg. It should dry up and drop off but if you think it will get caught on anything you can trim it with scissors. They are very snuggly when first hatched and it's so adorable the way they cuddle into your hands.
checked on other chicks 2 seem to lay and balance but they may been the 2 that hatched yesterday
But keeping them warm enough is important. Just make sure they are all eating too. Sprinkle a bit of food around everywhere so there's always something for them to pick at.