What is your 2-3 month old's sleep schedule like?

704bride

DS sleeps VERY well at night - often for 6 hours stretches, but as long as 9 hours.  He sleeps very well in his car seat and has even slept longer than 4 hours in it (okayed by pediatrician).  We've been struggling with crib naps.  If I catch him early enough, before he's over-tired, he can put himself to sleep just by watching his mobile, but he only stays asleep for anywhere between 20-45 minutes.  Maybe as long as an hour.  I'm just not sure what to do to get his naps to last longer.  We have to bring DS to and from preschool 4 days a week, so he always naps well in his carseat on those days, but I want him to learn to do that in his crib, too.