Research has confirmed that 0-3 years is a critical period for developing children’s intelligence, because 0-3 years is an important stage of human brain development. The brain weight of infants in this period increases especially fast, only about 370 grams at birth; it increases to 660 grams at 9 months; it can reach 1200 grams at 3 years old, accounting for about 70%-80% of the adult brain weight. Curiosity and the ability to accept things from the outside world are very strong in this period, and their memory can also reach 50% of the adult. Good auditory function is an important condition for intellectual development, and hearing plays a decisive role in the development of language. Experts point out that the golden period for children to learn language is from 1 to 3 years old. Infants and toddlers, mainly to listen to speech, if hearing problems at this time, will certainly cause language development disorders and lead to learning and interpersonal difficulties, thus affecting the development of intelligence. The mother’s language is the “nutrient” for the development of intelligence and hearing of infants and toddlers. A wise mother, when her child is born, should caress her child more, and the love expressed by this silent communication is undoubtedly a fresh and timeless first stroke on the child’s young mind, thus starting the child’s mental activities, feeling the existence of the strange world around, and establishing their own thinking activities. The child’s mental activity is activated, he or she feels the presence of the unfamiliar world around him or her and builds up his or her thinking. When the child is learning to speak, this involvement in the mother tongue is even more important for the child’s intellectual development. This is because the earliest intellectual activity of the child is learning to speak, and the child’s understanding of the world around him or her and the formation of his or her thinking skills are achieved through learning to speak. Studies have shown that under normal conditions, babies begin to learn to speak 6 months after birth. Children around 1 week of age can often say two or three words. 18 to 24 months is a period of rapid development of the child’s language, they began to first signal system of pure sound signals, into abstract meaning of the word signals, thus forming the first major features of abstract thinking. The mother should communicate verbally with her baby. Use as many people and objects around the child as possible to encourage the child to speak more often. For example, when giving a bath to your child, say: “Mommy gives the baby a bath”; when you see a car, ask your child to learn how to honk; when you see the sun, ask him to greet the “Sun God”; when you see an aunt, ask him to say “Hello, Auntie “, when you see grandma let him say “Grandma good” and so on. The first is to pay attention to the fun, in the child’s interest in the game activities, consciously guide the child to learn to speak; second is to pay attention to the image, that is, in order to make the child gradually master the rich words, should try to make these words together with the things represented one by one, together with imprinted into the child’s mind.