DD is 5 months on 4 hour easy...But will not sleep longer than 2-45 minutes naps...she's never slept longer than 1 hour since birth...Nighttime sleep is fine 7:30pm to 6:30 am.
There are developemental things going on: teething, and rolling to name a few
Should I just let it go? She wakes up wailing but as soon as I walk in, she is smiling and happy?