Because of size, small babies may have trouble staying warm. Baby's skin should feel warm to touch on his chest, under his clothes. Use a t-shirt and booties under a sleeper. Cover with extra blankets when sleeping. Keep a hat on for first week or so.
Babies loose a lot of heat through their heads.
Your baby may seem to sleep all the time. Rather than letting your baby set the feeding schedule, you may have to wake her up for feedings. Nurse every 2 to 3 hours during the day. Plan to nurse at least once a night for several months. You may have to wake the baby if he tries to sleep all night.