It's normal, but the family should give the child correct guidance and tell the child that it's normal and don't make him nervous. As a parent, you should be calmer than your child, and you should give him some physiological knowledge. You can also find some physiological knowledge online to show him. When I was in the second grade, the school biology teacher gave us a whole class. Although a little embarrassed, it is still useful for us ignorant teenagers and solves our curiosity about the opposite sex. Therefore, I suggest that parents should not only give their children physiological knowledge, but also give them appropriate guidance from the opposite sex! ! !