DS is now 11 weeks old. He was originally sleeping 6/7pm to 2am (7/8 Hours) He'd then wake at 2am feed and nearly drop straight back off to sleep for another few hours. DP goes to work at 4 so that usully woke him up so he'd feed and go back to sleep till around 6/7am. He'd have about 12 hours sleep at night.
Now he sleeps 8pm to 4am (8 hours) but really doesnt want to go back to sleep at 4am despite being grumpy tired.