Hungry Baby? 🤷‍♀️

So my baby is 3 months (15 weeks) .. 15 pounds 8oz . He’s on formula and is eating 4oz every two hours EXACTLY, sometimes 10-15mins earlier. Literally, every 2 hours. He get at least 9-11 bottles a day. WHY???? Why does my baby eat so much? Is this normal? how much do your baby take in?