Like @savanahr777 said its normal for them to go for a few days. but he's too small for juice. you can use a qtip with Vaseline insert into his booty just a little and he should poop within a few mins. @optimusviolet
@savanahr777 I noticed it started on Friday.... and he's been really fussy :/ I'm gonna try the gripe water to see what happens
How many days has it been if I remember correctly a few days without going is normal for a baby. You can rub his tummy, place him on his tummy on you thigh to put some pressure on his belly, and try the bicycle movement with his legs. That's all I can really remember also grip water may or may not be for that I know it helps with gas.
My daughter had bad constipation dr said prune juice mixed with water you never want to do 100% juice but she was 3mo when we had to do that I would call baby's dr before I did anything.
pedilax