4 month sleep regression?

HELP a mama out.

My son is almost 16 weeks old and this past week he’s started fighting going down for naps or bedtime, he’s extra fussy when it’s time to feed, but other than that, he’s a happy kid. I’m thinking it’s the start of a brain development leap/sleep regression. Anyone else experience this??

Also, if anyone has tips for getting your baby to nap longer than 30 minutes-I’ll take all the advice I can get.