Opinions?

Chasity
Over the past couple days my son will eat a 4 ounce bottle and after we burp him he starts smacking his lips again like he's still hungry. I don't really want to give him much more than 4 ounces yet because he will occasionally spit up and he's only 4 weeks. We are going to be asking his doctor at his checkup on Monday but I'd like some other opinions first.