Wake windows

We were doing 1.5-2 hrs at 4 months. By the time she was almost 5 months old she was really fighting naps and it would take her forever to settle. At 5 months we switched to 2-3hr windows and dropped the 4th nap which has made things much easier.

My daughters wake window is about 1hr 30/45 and she is just turned 5 months

Whatever he chooses really he sleeps really well from 8pm till 6am so aslong has he get some sleep during the day I'm not too fussed

Around 1.5 to 2 hours. But I tend to let her sleep when she wants. The only thing I struggle with is the last nap of the day. And if we are out late she will fall asleep in the car and then will not go to sleep