baby hognose not eating

[Ivanator]

So my friend asked me about how to get his hognose to start eating again after coming out of hibernation. I have never kept one, or any snake that naturally hibernates during the winter so I thought I'd ask the experts. Around late november, early december, it started getting really cold here in CA and his snake stopped eating. It's a newborn, probably only a month old when he got it, so he read that they hibernate so he just kept it cool. Now that it's warming up a lot, it started becoming more active so he tried feeding it a few weeks ago and it didn't take it. He's been trying every week and it doesn't even seem interested and today he told me that it's starting to lose a lot of weight. It has never shed since he got it so it's still really small. What is the best way to get it to start eating again? Also, is the weight loss natural in snakes that hibernate since they don't eat for so long or should he really be concerned? Since I own retics, weight loss is a serious concern so I told him to try to feed one more time later this week and if it still doesn't eat, to take it to a vet especially since it's just a baby. Thanks ahead for the responses.

Oh... He keeps it in a 10g aquarium with a hide on the hot and cold side, he has a lot of decorations and he keeps it on aspen. He said the hot side is at 92 and the cool side is in the high 70's and it drops about 5 degrees at night.