Likely gas/will pass
It is easy to attribute feelings that we experience when we see an infant struggle.
The fact is that they are wired to do similar responses for many issues. When tired or fussy, their upper arms fold at the elbows & come in to the body, the knees come up and the belly pooches out. Whether this is gas, cramps, tired or mad; they appear the same.This subsides some by 4-5m when they can roll over.