It is a leap for a baby to lie on his back and stand up. Often, some parents often "learn to sit" or even "learn to stand" with their 3-4-month-old babies. In fact, sitting and standing too early is extremely unfavorable to the healthy growth of the baby. Because children's bones contain more organic matter and less inorganic salts, they are small in hardness, elastic and easy to deform. In particular, the cartilage disc between the baby's vertebrae is thick, while the lateral ligament is loose. Sitting up and standing for a long time can easily lead to the deformation of the baby's spine. Learning to walk too early will not only lead to the bending deformity of the baby's lower limbs, but also lead to the "subluxation of the radial head" of the elbow joint of the small hand pulled by the parents.

Some parents believe that early exercise for children to sit, stand and walk can prevent the occurrence of vitamin D deficiency rickets. In fact, on the contrary, children with rickets are prone to skeletal bending deformity once they are overloaded because of osteoporosis. Therefore, children with vitamin D deficiency rickets cannot just sit or stand more.

Generally speaking, children's intelligence, bones and muscles develop normally, and they will sit naturally in 6-7 months, walk with their feet in 12 months, and walk independently in 18 months. Therefore, experts believe that it is not appropriate to guide children's sports development in advance, and parents should not be too hasty.