I’m confused

Alyssa

So first on my almost 5 month old has a dilated kidney and has had it since I was pregnant with him. But I’m curious to know if anyone has had their baby have a hard time going pee? And what could be some symptoms to look out for? I’m not sure if my LO has it or not but lately he’s been grunting a lot. He’s not constipated because he has been pooping at least 2 times a day.