Hungry baby!

My boy is just over a month. He's getting 4 1/2 ounces of formula right now at each feeding. This week his appetite is through the roof. Today especially he's eating every 2 hours. I'm thinking of bumping him up to 5 ounces. Just curious if this is normal for 4-5 weeks? His next doctors appointment is next Friday but I wanted to knows everyone's thoughts and how much your babies are eating and how often. Thanks!