Some chicks are broody stupid at a week old though if hand raised. They don't always know where to go if cold, or to follow mom.
Yes, I think this was the issue yesterday when I tried to intro them. The new babies didn't respond to mom's calls & stood huddled in the corner shivering instead of going under mom with the other babies.
I will try to sneak them in tonight...I may just end up keeping them in the brooder for another week & then putting them outside.
Thanks for the tips!