Hi there,
I'm really new to this message board and I seem to have exactly the same problem as you do... the 30 minutes for us seems to be the problem and it happens without fail for every nap...
I have an 11 week old DD and she hasn't had a nap longer than 30 minutes since 2 weeks ago - in her crib that is....and that was the ONLY one she's ever had in her crib for that long. She is fine when we go out for a walk in the afternoons and then she'll nap for 2- 3 hours but I know that this is not good and I want her to develop good napping habits....
She is oK at night.... She's been going to sleep around 8:00-8:30 and then up at 3:30 for a feed, and then down again until 8:30 or so...... . This schedule is sometimes changed up for 2 feeds at night, one at 2:30 and then another at 5:30.... she seems to keep going in between these 2 schedules... a few days with one schedule, and then a few days with the other....
I'm getting really frustrated trying to get her to nap during the day... She goes down fairly easily, but then after half an hour, wakes up, then I keep trying to get her down but each time she doses off with sh/pat, she only stays down for a few minutes at a time after the initial 30 minute nap....when she wakes up each time, she has a BIG cry.....
I would love some insight on this problem as well!!! I'm so frustrated!!!!