Newborns gain weight particularly rapidly in the first 3 months of life, and the child’s weight in the first 3 months of life is about twice the weight at birth, for example, if the child is 6 kg at birth, it reaches 12 kg 3 months after birth. However, most children’s weight gain at full term is often about 1-1.5 kg more than their birth weight, for example, if a child weighs 3 kg at birth, it is around 4 kg or 4.5 kg at 1 month of age. So, if the child grows 2 kg or 3 kg at full term, it is basically normal. If the child’s weight gain is very slow or severely below this value, it is important to consider that there is improper feeding or other problems.