Why does an adult do physical education with an infant?

1) A baby is not capable of conscious control of his body.
2) In an infant, unconditioned reflexes predominate.
3) The adult uses these reflexes to exercise certain muscle groups in the infant. For example, if you tickle the soles of a child, then he will have a crawling reflex.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.