Baby’s height is an important indicator of pediatric physical development, the average height of a five-month-old baby should be: 63.2~68.6cm. 5-month-old male babies, the average length is 65.9cm, greater than 71.3cm is too high, less than 60.5cm is too short. 5-month-old female babies, the average length is 64.1cm, greater than 69.3cm is too high, less than 58.9cm is too Short. After 5 months of age, babies begin to slow down and have a tendency to grow slowly. 5 months old baby in bed can freely prone position, want to crawl forward, but reach can not yet raise, so crawling is somewhat limited. 5 months old baby’s physical further development, the nervous system is also gradually towards maturity. Intelligence is also further development, as the baby grows taller, weight increase, the demand for energy and a variety of nutrients increased, breastfeeding-based has been unable to fully meet the nutritional needs of infants. Therefore, while continuing to eat breast milk, to gradually add complementary foods is very necessary. Add complementary foods can not be too hasty, to slowly, to follow a small amount, a single start, and gradually with the age of the month and increase the variety and quantity. In summary, 5 months baby height and nutrients are inseparable, must pay attention to the supply of nutrients in all periods.