The average height of a 30-month-old baby girl is 90.7 centimeters and her average weight is 12.7 kilograms, but there are individual differences. In general, the normal height of a 30-month-old baby girl is about 90.7 cm and her weight is about 12.7 kg. However, height and weight are affected by heredity, nutrition, exercise and other aspects, and there are large individual differences, so the normal values should not be regarded as absolute standards. This month’s children need to go to the Children’s Health Department to complete the corresponding month’s physical examination, parents can know whether the child’s height and weight are normal through the physician’s physical examination. If the height and weight of a 30-month-old baby girl is significantly different from that of a baby of the same age, it is recommended that she seek medical attention in time to rule out disease, and to intervene and treat the child promptly if necessary.