DS sleeps 11-12 hours at night (not continuously, he gets up 2-3 times to nurse and goes right back down). But during the day, he takes naps that are 20-60 minutes long, typically 30 minutes. I can't figure out how to get him to nap longer. He takes 4-5 short naps but I thought to get the better sleep, they should have 2-4 longer naps. Anyone have any tips to get longer naps in? He sleeps swaddled in his crib.