Characteristics of the growth and development of the motor system in preschool children How to take better care of children

Characteristics of bone growth and development

1 Easy to bend deformation

Preschool children's bone organic matter and inorganic salts account for one-half of each, the content of organic matter is higher than that of adults, inorganic salt content is relatively small, so the bones are relatively soft, tough, hardness is small, easy to deform under the action of external forces, with the continuous growth and development of individuals, the amount of inorganic salt deposits in the bone gradually increases, the content of organic matter is relatively reduced, the elasticity of bone is reduced, the hardness is significantly increased, the bone in preschool children's bone is relatively more organic matter, the hardness of the bone is small, the toughness is strong, and the periosteum is thicker. The osteoblasts are more active, which is conducive to bone growth and regeneration. Therefore, once a fracture occurs in preschool children, there will often be a phenomenon of folding and continuous, called green branch fracture, and after the fracture of preschool children, the healing speed is faster than that of adults. Therefore, preschool children should be treated in time after the fracture, otherwise the cross-sectional interface will not match after the fractured bone heals, and local bone deformation and bone firmness will decrease

2 Less toughness

Lu bone. After the birth of the fetus, the degree of ossification of the lu bone is low, the direct connection between the bone masses has not yet been completed, only connected by connective tissue, these parts become the fontanelle, the fontanelle has two main places, divided into anterior fontanelle and posterior fontanelle. The anterior fontanelle is located in the center of the roof and closes around one to one and a half years of age, and the posterior fontanelle closes at the latest before 4 months after birth. Fontanelles are more common in head deformities, and late closure is often caused by calcium deficiency

Carpal. The wrist bone of newborns is composed of cartilage, and it is not until the age of 12 that the ossification is basically completed. Therefore, the wrist tolerance in preschool childhood is poor, and the time should not be too long when doing fine movements to prevent fatigue from causing wrist damage.

spine. With age, the development of movements, physiological curvatures of the spine gradually form. The spine of newborns has only the sacral curvature. When the head is raised about 3 months after birth, the neck curve is formed, the neck spine is convex, when sitting at about 6 months, the chest curve appears, the chest spine is convex, the chest spine is convex, when the one-year-old is formed and begins to walk, the waist curve appears, the waist spine is convex, the four physiological curvatures of the spine in infancy have appeared, but they are not completely fixed, and they will disappear when lying flat, generally around the age of 23 4 physiological bends are more stable

Seeing this, I would like to ask you how many months can the post-fontanelle closure time be considered normal?

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