HELP peeping egg without a mom

[newgoatgirl]

3 of my banties eggs (Orpington Cochin cross) hatched on the 14 one stared peeping last night but she is now not sitting on it. I put the egg under another hen who just started sitting on 12 eggs that I ordered for now but I don't want her to abandon her eggs either. I have a home made brooder housing three chicks at the moment who hatched on the 15. What do I do with this egg? It's still peeping and pecking but no visible pip and sounds weak. I remember as kids something similar happened and we put the eggs under our armpit until they hatched but not sure if that was the best course of action lol. Help!

 

[k magnuson]

Just keep the egg warm. Maybe put it under a warm heat pack, but make sure the heat pack isn't to hot.