Lots of pee no poop!?

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My little boy is almost 2 months old and for the past 3 days he hasn’t pooped, but he has peed a lot. He doesn’t seem in any pain only gets frustrated when he pushes and nothing comes out, he’s also farting. I tried everything, stimulating his anus, water, water with apple juice, water with prune juice, leg exercises, and massages. I’m out of ideas. Is this normal with breastfed and formula fed babies? Or should I take him to the doctor? Please help I’m a ftm.