The nutrients that newborns need to supplement include iron, cod liver oil, vitamin K, vitamin D, protein, sodium and calcium, which are beneficial to the healthy growth of babies. Newborns are at a special time in their development when nutrient intake is crucial, but basically the nutrients in breastmilk are sufficient to meet the growth needs of newborns, and it is not recommended to add complementary foods. There are some other aspects that need to be considered, such as insufficient breastmilk, or the newborn’s digestion and absorption function is not well developed, etc. In this case, the newborn’s growth and development should be evaluated, and then consider adding the required nutrients. If you are not sure whether your baby is suffering from nutritional deficiencies or stunted growth, it is advisable to take your baby for regular medical check-ups.