Baby boy always hungry

My 5 month++ old son always seems hungry. I wonder if it’s normal thing for baby boy? I normally feed him every 3 hours, 150 ml. But recently, it went to every 2 hours or sometimes even after one hour of his feeds he will be very fussy. Tried so many things like put him to sleep or etc but doesn’t works. After feeding him milk again, he’s ok. I’m afraid of overfeeding him but so far he doesn’t throw out milk. #firsttimemom