It is normal for newborns to grow 3-6cm in a month. The growth of newborns’ length is related to both gestational age and postnatal nutrition. For premature babies, height growth is slower than full-term babies. For full-term babies with better nutrition, adequate intake, digestion and absorption, height grows faster. If the baby does not have enough intake after birth and suffers from diseases, height may grow slower. The average length of a baby at birth is about 50cm. the fastest growth in the first year is about 25cm, and the height in the first year is about 75cm. for breastfed babies, it is recommended that mothers eat more protein-containing foods and calcium-containing foods, which will help their babies’ development.