My 1mth old babygirl is the same too! We guess it’s colic that’s making her uncomfy. Even while breastfeeding or sleeping and she wants to fart/poop, will cry/grunt or get very fussy. On good days, will be quiet after diaper change. On not so good days, she will cry murder and I will become clueless. Husband will carry her in a different position to try and soothe her. Still figuring out everyday...
https://sg.theasianparent.com/decoding-your-infants-cry
Adrianna