27 days old baby -overfeeding?

Hi mommies. Question po. My baby boy is 27 days old. Mixed feed po kami (formula and breastmilk that I pump since may latching problems kami ni baby). I read that at his age, he should be drinking 3-4 ounces of milk every 3 to 4 hours. But he does 2 ounces every hour or 1.5 hours. I'm worried kasi baka overfeeding na. Gusto ko din sana ma correct yung feeding cycle namin kasi instead of him sleeping for 3-hour stretches, he sleeps an hour then asks for milk again. This happens althroughout the day.