The hazards of eating salt for babies within one year of age usually include damage to the kidneys and the appearance of calcium deficiency. 1. Damage to the kidneys: because the kidney function of babies within 1 year old is still relatively weak. If the baby eats salt, it is easy to cause thirst, increase the baby’s water intake, increase the burden of urine produced by the kidneys, easy to cause kidney function damage, is not conducive to the normal growth and development of the baby. 2. Appearance of calcium deficiency: because the baby will drink a lot of water when eating salt, the increase in fluid excretion will also take away more calcium from the body, resulting in calcium loss. The baby will have various bone, muscle and nervous system developmental delays, thus affecting the growth and development of the baby. Babies within one year of age have a very low demand for salt, and the salt contained in breast milk and milk powder can meet the growth needs of babies, so no additional salt can be added.