Keep an eye and monitor size, if they eat,drink ect from your feeding station… weighing them is another good way to monitor if they are gradually putting on weight but look healthy as in running around, bright clear eyes, no obvious other problems
You have to be careful if you do weigh them not to disturb the mum or remove them from their mum for a who long a time make sure you wear gloves to prevent your sent going on to them as otherwise the mum may abandon the juvenile
Once they are a few weeks/months old don’t be surprised if the mum leaves them this is normal behaviour
It’s mainly keeping an eye on the weight if they are losing weight that is a sign of internal problems and because of the mild weather in winter months recently they have been very confused meaning some are hibernating early some are hibernating late or coming out early but as long as you have food and water around they will probebly come back
For hibernation the ideal weight for a juvenile/ adult is 600g if they are not this weight then they will risk not surviving hibernation so then it’s safer to contact your local wildlife animal rescue for a check
Hope this information clears up any un awnsered questions feel free to ask me anymore