15 week old sleeping

My 15 week old is sleeping a lot. Our schedule isn’t the best because he goes to bed around 1am and he normally wakes up around 11am but I breastfeed him around 7am when I wake up and he goes right back to sleep. During the day is more of an issue because he doesn’t really sleep he’ll nap for maybe 45 minutes or an hour and that’s the longest nap but he usually doesn’t nap that long. He was sick the past few days, he had a cold but he’s getting over it and now he’s napping up to 2 hours during the day and sleeping his normal time. He has like 2 or 3 naps during the day.