Babies are usually recommended to be more than 1 year old before you can eat salty salt, this is because children, especially small babies, immature kidney development, if too much intake of salt, that is, sodium chloride, easy to cause sodium and water retention in the body, causing edema and other manifestations of the child, so it is not recommended to eat salt too early. Babies eat too much salt, but also has the following hazards: First, high salt diet can make the oral saliva secretion decrease, lysozyme is also reduced accordingly, conducive to a variety of bacteria, viruses exist in the upper respiratory tract. Second, high salt diet due to the osmotic effect of salt, can kill the normal parasitic flora of the upper respiratory tract, resulting in dysbiosis leading to morbidity. Third, high salt diet can inhibit the reproduction of oral mucosal epithelial cells, so that they lose the ability to resist disease. Fourth, a high-salt diet can also affect the absorption of zinc in children’s bodies, which can lead to zinc deficiency, which can lead to a series of diseases such as low resistance, and can also cause disruption of the ionic balance in the body, so it is not recommended to give children before the age of 1 to eat salt.