Some nutritional supplements contain substances similar to sex hormones, such as the popular children’s multivitamin nutritional tablets on the market, which contain substances related to inducing precocious puberty in children. The common supplements that people use, such as American ginseng and propolis, are rich in hormones, especially after a child’s illness, and many parents take it upon themselves to give their children supplements, but in fact children recover quickly from illnesses, unless they are chronically ill, so basically there is no need for supplements. At the same time, parents should not buy less than ripe fruit for their children to eat, if the fruit listed about half a month to a month before the ripening period, and the color looks good, it is likely to have used ripening agents, even without ripening agents, the fruit is not good, and low nutritional value. Although ripened fruits show ripe traits, the skin or other aspects of the fruit will still feel immature. For example, naturally ripe watermelon, due to sufficient light, so the melon rind flower dark bright, clear stripes, old knotted melon tips; ripened watermelon rind color fresh, light stripes, melon tips green. Second, you can identify the fruit by smelling the smell. Naturally ripe fruit, most of the epidermis can smell a fruit flavor, ripe fruit not only no fruit flavor, and even odor, overripe fruit can often smell the smell of fermentation. Ripe fruit also has a distinctive feature, that is, the weight is relatively heavy. The same variety of the same size of fruit, ripe compared with the natural ripe to much heavier, it is easy to identify.