Personally, I think you have to look at both poop and pee. I myself have a kid who stopped pooping early. Based on all of this, he would have not been getting any milk. But he was fine. More than fine. He never lost any weight after birth, and by the time he was 2 days old, he had gained 2 ounces. Obviously just fine, just not pooping. I was panicking a bit, and my doctor was the one who was calm about it. No, he didn't poop for like 14 days at a time, starting around 7 days of age, but he was gaining like a bad weed.
So, to me, you must look at the whole picture. If baby is pooping a lot, what is the weight gain like? If baby isn't pooping, what are the wets and weight gain like? It's an easy way to decide if you should perhaps have the baby assessed IMHO.