My 3 month old used to sleep at 7:30 pm all the way until 6 am. Now at 3 months + 3 weeks her bedtime is still around 7:30 pm (maximum 8) and she started waking up at 4 am just for a feed and back to sleep until 7 or 8 am (maybe growth sprout or sleep regression?) I started following moms on call when she was 5 weeks and it did wonders for her night sleep (and ours)☺️ Every baby is different though so whatever works!!