Help baby wants to stay up !

Marlene

Help! Baby has developed new sleep schedule for the past week! He wakes up about 730am will have breakfast play for a bit then sleep around 930 till about 11. After lunch and some play he'll nap around 1 till about 2. He then stays up until about 8 but only sleeps for half an hour, before he wakes up again and wants to play and no matter what I do he won't sleep before 1030 11! He used to sleep around 8 830 help!l