Newborns can grow about 4cm in the second month. The average length of a newborn baby is about 50cm at birth, and in the first three months of life it usually grows by 11-13cm, or 4cm per month on average, so a newborn baby grows by 4cm in the second month, making a total length of about 58cm at this time; however, for full-term babies younger than the gestational age, the growth of body weight and body length is slower. If you find that your newborn’s length is less than 58cm in the second month, you should consider that it is due to insufficient nutritional intake, and it is recommended that you strengthen breastfeeding. At the same time, give newborns appropriate sun exposure to promote calcium absorption. Generally speaking, in the first year of life, the length of newborns will increase by about 25cm, so the length of one-year-old newborns will be about 75cm. during this period, it is necessary to enhance the nutritional intake of newborns to promote the growth and development of bones.