My 11 week old was previously feeding for about 40 mins and sleeping for 3-4 hrs between feeds but now he suddenly only feeds for about 15 mins before either pulling off or falling asleep. I wouldn't mind if I thought it was a case of him feeding more efficiently but as a result of this he is now waking about every hour and a half to feed again which is doing me in! I've tried tickling his cheek, ears and feet to keep him awake but it doesn't seem to help. I'd rather not get into taking clothes off to keep him awake as I want him to go to sleep once he's fed.
Any ideas as to why this change has occurred or tips for dealing with it would be most welcome.