boy mom help with newborn

My son is a week old. I don't dress him much since we haven't gone anywhere and why dress him at home when you have to change him all the time. But the few times I have he's peed through his clothes, like it gets on his back. And a couple times including last night he like doesn't even pee in his diaper, he does, but it was all wet on his bed and didn't feel too wet on his diaper. And I have the ones that turn blue when he has a dirty diaper and it didn't even do that when how wet bed was it should of done that. How do I fix this? His diaper is on tight enough.