A few days ago, I took my children on a spring outing with my friends. We couldn\’t help but be very surprised when we saw several children standing together, but their sizes were so different. Children of the same age group can actually differ by one head in height. One of the mothers said anxiously: \”My son is the shortest. His father and I are not short, but this child just doesn\’t grow up. He is still taller after junior high school.\” Less than 1…