NB Question(almost 3w old)

My son is fairly easy,

I change him before or after feeding if neccecary.

however, after I feed him

(only formula fed -similac pro-sensitive)

he screams and cries, he only calms down when I pick him up, he will fall asleep quickly and then I'll try to put him in his pack n play (which he had no problem being in before) he wakes up and screams again.

I check his diaper, nothing

I try and feed him, he rejects it

Obviously, he will have a blow out(his stool is normal for formula fed) and I can tell he feels better but then he wants to eat again and the cycle repeats.

I'm wondering if he has colic, and what I could do to help him.

He has his 1 month appointment next week so I'll ask the pediatrician.

TIA