6 week peak grumpiness?

Haylie

My 6 week old just suddenly started getting really grumpy.. usually about 6pm for a couple of hours. Sometimes I can’t calm him down at all.. sometimes I can pump an extra couple of ounces (after he’s already ate) and it’ll calm him down. But usually he won’t won’t my boob or his passie and he’s screaming his head off. Is this a growth spurt or is It maybe colic?