Eating salt is not always harmful to babies, and if only a small amount of salt is added, it will not usually cause any harm. If the amount of salt added to the baby is excessive, it may affect the baby’s kidney function, cause partiality, picky eating and other adverse effects. If parents add some salt to the baby’s complementary food, only a special small amount, usually does not cause any harm to the baby’s health, but need to pay attention to the small months of age of the baby’s complementary food is generally not recommended to add salt. But parents need to be careful not to let the baby intake of salt exceed the standard. If parents add more salt to the baby’s complementary food, the daily intake of salt exceeds the standard, in the long run, may be detrimental to the development of kidney function. The main reason is that the baby’s kidneys are still immature, eating a lot of salt will increase the burden on the kidneys, which is not conducive to the development of the kidneys. And a large amount of salt, may make the baby taste heavy, is likely to induce partiality, picky eating phenomenon. It can be seen that letting the baby eat too much salt may cause some harm, therefore, parents should strictly control the intake of salt. When the baby is found to be in discomfort, he/she should seek medical advice as soon as possible.