Every child’s intake is different, there is no specific amount for certain age. If he can take 70ML without spit ups or discomfort, can maintain 70ML since you mentioned he doesn’t want anymore after 70ML. Subsequently increase by 5-10ML as he grows and reduce back if he spit up often. Also do note that on some days (next should be around 3mo) during certain leaps eg milk strike or growth spurts, he will tend to drink lesser or more with shorter intervals. These are all normal and don’t have to worry as long as diaper output is good. 😊