my son 5month and 25 day old formula fed from birth takes only 90 ml milk after 5-6 hours sometimes refuse to take after 6 hours is it normal he was born premature with birth weight 1.8 kg

A. hello is the baby is gaining a minimum of 600 gram to 800 gram per month then it is a good weight gain and nothing to worry and it means the baby is getting sufficient milk and nothing to worry and any concern then check your doctor