How much is your baby eating?

Paisley

My son is 3 months old and very large. He was eating quite a bit and over the past week or 2 has been eating a lot less. He has been eating around 4oz every 2.5 hours but sleeps for around 8-10 hours every night(I know I’m lucky!)But he doesn’t even wake up hungry and it’s a bit concerning to me. Does this sound like enough? Also, is this too early for teething?