Sleep regression cranky baby


Advice on sleep regression from experienced moms??

My son is 16 weeks. He used to take a good 2 hour nap. Now he won't sleep more then 20 minutes. And at Night hes up every 45 min to an hour.. I saw EVERY hour last night and the night before. Im exhausted.

I still feel like hes too young to cry it out but he just screams and screams if I don't pick him up and hold him. He falls back to sleep and then up again. Im at my wits end. Need advice