My sons cries every night alien 12-2am or 2-4am sometimes longer.

He calms for like 5-10 minutes then gets pissed off again for like 10 minutes then calms and it repeats. When he finally falls asleep he sleeps for like 6 hours.

His cry to me looks like his tummy hurts but my fiancé doesn’t think so.

He’s breastfed, sleeps fine during the day, he’s almost 6 weeks old and has been doing this since 4 weeks (I haven’t changed how I’ve been eating since).

What do you think it is?