6month regression

My baby started sleeping through the night at about 8-10 weeks. Some nights on occasion he would wake up but it was rare until about 4 months. For about 2ish weeks he would wake up between 2-3 times a night then went back to sleeping his full 8-9 hours. I guess i need to mention that he slept great at night but would absolutely fight me for naps. Now he’s 6months and he’ll take 1-3 hour naps during the day and wake up every 45mimutes-2.5hrs during the night screaming. Is this a natural regression or do i need to shorten naps so he’ll sleep better at night? I also need to mention i was doing the drowsy but awake method and he would soothe himself to sleep but now he needs to be dead asleep or he’ll cry.