DD is nine weeks and EBF, over the weekend has been feeding like mad! She's still going 2.5 to 3 hours between feeds but whereas she would feed for 15-20 mins, she's feeding for anything up to 90 mins, going off into a lovely deep sleep then waking and it's feeding time again! If it is a growth spurt how long do they last as I'm getting a bit sore!?!