I'm EBF my 11 week old daughter (on demand) who is gaining well and producing plenty of diapers, but her feeding pattern/behaviors have changed pretty dramatically the past few days. She typically eats every 2 hours during the day for 10-15 minutes each session, with some longer and shorter exceptions. Since Monday, she's only been eating for 5-7 minutes, with the exception of late night and early morning feeds. She ends the session by suddenly pushing off the breast, arching her back and screaming if I try to put her back on. I've also tried offering the other breast, which she refuses. Once I stop encouraging her to latch back on, she's perfectly happy. The only other change in behavior is that since this has started, she has only been napping for 30 minutes at a time. I'm trying to remain relaxed, accept that if she's not eating enough she'll let me know, and monitor her diaper output, but obviously this change is worrying. This has happened for a few times before, but just for a day, and then she's gone back to her typical 10-15 minute feedings.
Any thoughts? Should I be offering more frequently/less frequently? I've heard that babies get more efficient as they grow, but this seems really sudden for that. My secondary concern is if it will impact my supply (i.e. if she has several short feeding sessions in a row, will my supply drop?). Should I be pumping to maintain supply?
Thanks for any thoughts/suggestions!