Feeding

Devora

So Im a mom of three. My first and second were born at about 7 pounds and ate regularly at 6 weeks, 4 ounces every 3 to 4 hours. My third child was born at about 11 pounds and is 6 weeks but I don't think 4 ounces is filling him up. After every feeding he'll want more. He'll cry 2 hours after wanting more. He's 13 pounds now and Im wondering if its okay to move up to 6 ounces or is that too much?