I have just recently managed to get my 3month old dd to sleep in her cot. I put her down when she's on the verge of falling asleep and she usually falls asleep fine in the cot. In the day though she always wakes after 45 minutes unable to get back to sleep. The only way she'll sleep longer is on my nap with the breast in her mouth. I know she needs longer as she gets very grumpy and needs another nap within an hour. In the evening she sleeps fine from 5.30 to 11 so I know she's able. Does anyone have any suggestion on how to help her nap for longer?