There is no scientific evidence that children can grow taller by pulling their legs when they sleep. A person’s height is mainly related to environmental factors, genes, genes generally include the height of parents, environmental factors generally include the baby’s diet, physical exercise, sleep, mood state. So when the baby sleeps pulling legs generally can not let the baby grow taller, this is no scientific basis, but will make the baby’s bones and other damage. So to make the baby’s height increase, first of all to ensure that the baby enough sleep, because the growth hormone is generally in the night 10:00 sleep in a large number of secretion, in addition to the baby to have a reasonable dietary structure, more supplemental protein, calcium and other nutrients, and a sufficient amount of physical exercise, and so on.