I checked the places he was nuzzling and it wasn't where her nipples are --- she's not producing milk yet, she's still got 3 weeks to go. He eventually stopped nuzzling her stomach and moved over to her pants where the hair is so long his whole body could practically get buried. I wonder if he was just being a lovey little baby, or if maybe she was giving off some motherly hormones. It was just adorable though. I'm considering keeping the little bugger.