My LO is 4 months and still seems to need to sleep every 90 minutes or so. Because she tends to take catnaps of 30-45 minutes, she's taking at least 4 naps a day (although she I additionally will take a 1-2 hour nap at some point in the day). I'm wondering when she might either a) lengthen her awake time and/or b) take fewer (maybe longer) naps.

What has your experience been?