Feeding too much?!?!

Tiffany • William Dalas born September 18,2016.💙👶🏼 Teen Mom. 💕 YouTube: Dalas’ Mommy
My son is 3 weeks old. He ate 4 oz of formula at 3:15. It is now 4:45 and he wants more. I offered my breast but he doesn't want it. He is pooping and peeing just fine. He hasn't spit up at all. He doesn't have a fever or look jaundice at all. I feel like I am feeding him too much. Am I ? I don't want to make him sick😞