Sour squished face while crying - what does this mean?

FirstTimeMom💁🏻🤰🏻🤱🏻

I’ve noticed for a few weeks now my son will make a really sour face as if he’s eating a lemon and close his eyes right and wiggle his head back and forth - not while nursing but while crying.

I can’t figure out what’s wrong and why he’s so uncomfortable 😔

Even with a pacifier in to soothe him he will make this face and sometimes keep doing it and turn a little red in the face like he’s protesting to tell me something I just can’t figure it out🙇🏽‍♀️