gas, colic or something else

ann

hi moms! i have a 25 day old baby boy and in the middle.of the night he just becomes so fussy and starts crying. i tried feeding him and he will feed. but he wouldnt burp after that. i tried burping him for what it feels like ages but no burp is coming. then he would be fussy and starts crying. i dont know what to do. i dont have sleep as well. cpyld this be gas, colic or i should replace my formula. im mix feeding him BTW.