My DD was 4 months last week. Fully breastfed. She's been a really good night sleeper with often a last feed around 9-10pm, then sleeping until 3-5am for another feed. Then sleep until 7ish.
That's all gone completely out the window in the last week and a half though. I think it is a growth spurt/sleep regression/wonder week/leap whatever.
We've had a couple of nights of 1-2 hourly wake ups, many nights of feeds at 10,1,4,6. Quite unsettled in the early evening and early morning. Harder to put down than previously. I'm pretty much co-sleeping again from the first wake up - or if I don't co-sleep, I don't bother to move her into her cot, I just leave her in the double, and I go back to the other bed. I just feed at every wake up. Although I did notice the last 2 nights she hasn't really wanted a feed at the 5am wake up, so I've just resettled (which she found hard) but once she was asleep again she slept another couple of hours.
Really hoping it is just a phase and she'll move on from it soon. I LOVED her good sleeping previously, and know I was very lucky. From everything I've read, 4 months is the classic time for sleep problems.
As an aside, there is NO WAY my baby is even remotely ready for solids, I can't imagine even trying her yet - food just isn't on her radar at all.
ETA - DD is a one boob girl as well. Only rarely will she finish one boob and want the other (mostly during growth spurts). I agree with the Lactose thing - we have green poo problems and I find one boob is better for her.
Edited by Phoenix Blue, 22 September 2012 - 04:44 PM.