By my two daughters, ages 16 months and almost 3 months! The little one started sleeping through the night when she was just shy of two months old. We thought we were clear of the bleary phase of parenting a newborn. But now? She's back to being up between three and four a.m. I awaken to the sound of her sucking her fingers or trying to roll over in her bassinet, and then I'm basically up for the diaper change, the feeding and whatever follows.
And then there is the big one. She has always been a good nighttime sleeper; she's slept through the night since she was about three months old. Give the child a bottle and a snuggle, and she was down for the count. But now? She's up in the middle of the night too -- some kind of nightmare or separation anxiety or something. At 3:15 this morning, not even Dada could do the trick, so I finished feeding the little one then moved into trying to soothe the big one. We were both up from about 3 on with just a few winks of sleep until it was time to arise at 6.
I know they always say this part doesn't last forever, but it sure seems like it will, especially in those slow-crawling early-morning hours. At least they're not lonely for me; I get to share them with my husband and beautiful girls.