5 Month Old's have routines ??? Just kidding, they are going to regularly change their routine, just to keep you on your toes. Just follow her lead, its okay to go 3 hours, keep an eye on her, once you see her tired signs put her down. She may just do this for a few days and go back, or she may stay.

Both of mine have transitioned to mostly 2 naps between 5 and 6 months. Having said this it can change some days, and may be 3. Just try to keep in mind how many hours she has had in the 24 hours, a longer night sleep may mean a shorter day. Growth spurts at 6 months can mean they either sleep a heap or are awake more than normal to. DD2 some days like to be awake from 2.30 till 7.30 but if she is occupied she is happy.