I mentioned casually to our lactation consultant, Robin, how well Henry was sleeping. "Just to warn you, they often revert to waking more often around four months."
It wasn't a week later that Henry went from a guy who; went to bed around 8PM, slept anywhere from 5-9 hours (waking at most once for a quick feed) and then waking up for the day around 6:30... to a guy who; goes to bed around 7ish, wakes up for a 30 minute post bed time snack (?), sleeps till about 11PM, then wakes almost hourly after that. Until the start of the day around 5:30 ish. It is probably a combination of things. Teething, separation anxiety (as he now is aware of us, when we are there or not) and maybe making up for missed time during the day? (Since this all happened right when I went back to work.)
Experienced moms, when I mention this to them, say oh yeah, totally. New moms don't ever seem to know it's coming. So, consider this your warning.