Make sure the wee one has enough to eat at night to prevent hypoglycemia. (low blood sugar). I would leave this in a pen with a pee pad, water and food. Then he can have kibble (make sure it is for baby pups) when he gets hungry. I had a one pound pup and we did that. She was VERY picky, and vet warned us about hypoglycemia. We also had nutri-cal around and force fed her at night, if she didn't eat. (by force fed, I mean we put a teaspoon in her mouth, and she licked if off). Didn't like it much! At 16 weeks he should be close to eating himself. Good luck. Sue