Babies can not eat sugar and salt before one year old mainly because it is easy to cause dental caries, increase the burden on the kidneys and lead to calcium loss. 1. Easy to cause dental caries: babies before the age of one year to clean up the oral cavity is more difficult, if the baby to eat sugar, not in time to clean up the mouth, teeth parts, sugar will be left in the teeth, thus causing dental caries. 2. Increase the burden on the kidneys: the kidney function is not yet mature before the baby is one year old, if eating salt may increase the burden on the kidneys, which is not conducive to the development of the kidneys. 3. lead to calcium loss: too early for infants to eat salt, which contains a large amount of sodium, will lead to increased urination, easy to lead to calcium loss, affecting normal growth and development. Infants generally do not need special supplemental sugar or salt before one year of age, and the diet should be as light and digestible as possible.