Baby eating a lot!!!!

My baby seems to be eating a lot more than his norm lately. He is 16 weeks old and formula fed exclusively. His feeding schedule seems to be the ff:

6am- 6 oz

10am- 6 oz

2pm- 6 oz

6pm- 6 oz

9pm- 5-6oz

**would wake up sometimes at 3-5am needing a feed at times**

This would be 36 oz total if I end up doing 6 oz for the 6 feedings. I have read 4-6oz 6 to 8 times a day and some say 6-7oz 5 to 6 times a day (3-5 months). On the other hand, I have read not to exceed 32 ounces but then if I based it on his weight, he calls for way over the limit.

He is a tall and big baby. Probably around 18 pounds now and over 26 inches long to be honest. He was born over 10lbs and his doctor said he is expecting this much weight gain from him she'd be more worried if he isn't gaining weight at all. 😐

I do try to space it out and keep a every 4 hrs feeding schedule except for his last feed of the night. For the most part, he starts showing hunger cues at the 3 hr mark--but I try my best to extend it longer however if he gets real hungry, I go feed him.

What are your thoughts? I know every baby is different but would like to hear your experience.