In the language sensitive period of 0 ~ 6 years old; In the sensory sensitive period of 0 ~ 6 years old; 0 ~ 1 year-old sensitive period, eager to explore the environment with hands and tongue; 3 ~ 4 months is the best period to develop the ability to turn over.

Can exercise children to turn over.

Provide molar toys

Tactile game

Talk to the child and exercise him to pronounce vowels.