3.5 month baby flights nap

My once happily going down for a nap baby boy is now fighting daytime naps 😭

Is this the 4 month sleep regression everyone been warning me about?

Also, since 3 months, he only been napping for half hour at a time but have more naps like 4 times per day generally. Some days even 5 ! Is this normal? He used to nap a good 1.5 hours at a time on average. Any advice on what I can do to help him nap longer?

I’ve been just accepting the short day time naps as he’s a pretty good sleeper at night. He normally wakes 2 times per night unless it’s around his growth spurt or wonder weeks leaps period.