Cecilia is definitely changing her awake and sleep times. She was very consistent until recently, going exactly two hours between awake times, napping 2-3 hours, sleeping through the night for 8 hours with one or two sleepy nursings. A lot of that is now right out the window.
She still can't go more than two hours without a nap unless we're out somewhere exciting (but we usually pay the price for that later with crankiness). But now she's got a weird nap pattern. She will typically sleep for one huge nap, like 4 hours, and then one or two short naps. I wonder, at 4.5 month is she trying to get herself to 2 naps instead of 3? I would be fine with that if she was able to stay awake for more than two hours at a time, but as is, there's no way she can do just two naps unless they're both 4 hours long.
As for the night sleeping, that's totally erratic too. Last night she slept from 9-ish to 5, with one sleepy nursie at 1-ish. That's the first time she has done that in weeks. All the other nights she'd get up between 1 and 3 ready to be wide awake and playing. My only consolation is that she's a happy kid and not miserable during those middle of the night 2 hours awake sessions!
So...I guess the easy infant sleep time is officially over. :(