FTM... help please

i am a FTM and my daughter is 4 months old. she is such a good baby, happy, healthy, and thriving. she has slept through the night for awhile now, but here recently hasn’t been. i feed her 6 oz every 4 hours. her last feeding is at 10:30pm or 11:00pm. before she would sleep from 10:30PM or 11:00PM to 6 or 7AM. her naps are shorter but here lately she’s been taking 3 hour naps. is that normal?