It is normal for a full-term newborn to gain about 0.7kg in a month, but there are individual variations. There is a formula for calculating the weight of a child. If the weight is within the normal range, it indicates that the child is in good physical growth and nutritional status. The normal birth weight of a full-term newborn is about 3 kg. The formula for calculating the weight of a 6-month-old baby = birth weight + 0.7*monthly age, so a full-term newborn baby’s weight gain of about 0.7 kg a month is normal. The formula for calculating the weight (kg) of a 7-12 month old baby = 6+0.25*months of age. The formula for calculating the weight of a toddler over 1 year old = 8+2*age in kg. The above formula should be referred to according to the actual situation (e.g. actual weight at birth, etc.). There are individual differences in the weight of newborn babies, so you can consult a professional pediatrician to see if it is normal.