How many oz. Of milk is your baby drinking?

Emily

My baby is just turning 4 months today and he drinks either 3 oz every 2 hours or 4oz every 3 hours. Idk if that's too little or how should I stretch it out and give more ounces . Is he too small to add cereal to the milk. I get comments from some people I know , " girl this is all you feed him? You starving him " "you better add some cereal to that or give him more ounces , he's 4 months already." But they say it playfully not in a mean way. He's a chunker .lol

How often do you feed your baby and how many oz.?