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小学生包括1年级到6年级,年龄跨度为7岁至13岁。在这个年龄阶段,绝大多数的男孩生长发育的速率比较平稳、如体重1年内平均增加2千克,身高增加5至7厘米左右。但对女孩来说,11至12岁时已进入青春前期,有的月经初潮已来,所以体重与身高都处于第二次的快速增长阶段(第一次在1岁以内),例如有的身高在1年内可增加8至9厘米,因此营养的需要量要比以往多。另外,小学生阶段的日常活动量个体差异较大,一个爱好体育的孩子与一个安静少动的学生相比。
Primary schoolchilds range from grade 1 to grade 6 with ages ranging from 7 to 13 years old. At this age, the vast majority of boys grow and develop relatively smoothly, with an average increase of 2 kg over one year and an increase of 5 to 7 centimeters in height. But for girls, 11 to 12 years old have entered the pre-adolescence, and some menarche has come, so the weight and height are in the second period of rapid growth (for the first time within 1 year of age), such as some height In one year can be increased by 8 to 9 cm, so the demand for nutrition than ever before. In addition, there is a large individual variation in daily activities at the pupil stage, as compared to a less sporty child than a restlessly motivated student.