Not maintaining temperatures on their own, please help

Lauren
My girls and I came home yesterday from the hospital, they did great last night but today were cold their temps dropped to below 97. I have done skin to skin twice to bring them up and have brought them to urgent care, they sent them home with us with a list of things to try before they send us to the hospital to re-admit them. They're Temps are back up as of right now and they are in fleece sleepers, long sleeve onesies and microfleece swaddle blankets with another knit blanket over them. has anyone had to deal with this and what did you do to help them maintain their temperatures? I'm trying my hardest not to cry and breakdown, I really don't want to have to have them be admitted, lots of friends right now with children in the nicu having horrible experiences and I'm so scared they will be there forever. Please any advice, I just want to keep my girls home with me.