Babies can start to add complementary foods at 4-6 months, the specific time depends on the baby’s gastrointestinal tract and the desire to eat, can not be generalized. If the baby is artificially fed or mixed-fed, the digestion and absorption function is better, you can start to add complementary foods from 4 months old, and the principle of adding complementary foods is from less to more, from fine to coarse, from thin to thick. If the baby is exclusively breastfed, it is generally recommended to add complementary foods from six months, pay attention to a single type, mainly light, to avoid indigestion or accumulation of food and other conditions. When adding complementary foods at first, parents can feed their babies a quarter of egg yolk, and then add up to half an egg yolk after a few days. If feeding rice paste, feed 2-3 spoons first, then increase the amount after a few days, and so on. In addition, parents need to pay attention to the fact that if the baby has a tongue pushing out when adding complementary foods, the time to add complementary foods can be delayed appropriately, depending on the individual.