My son is 1 month and we are having a lot of trouble with naps. It takes a long time to get him down for naps (sometimes 45 min. or more), and he sleeps for no longer than 30-40 min. before I have to reswaddle and hold him again. By the time I get him down again, it's almost time for his next feeding. Then, after his 4 pm feeding, he's SOUND asleep on his own and will only wake up with a diaper change or a bath. Any suggestions for encouraging nap time at the times he's supposed to be sleeping?