Early childhood education is the most scientific "three-dimensional balanced development of physique, intelligence and psychological ability". Based on 50,000 benchmark data of children's growth, it extracts 9 growth goals of children: security, willpower, sense of purpose, attention, memory, thinking ability, balance, strength and speed. Babies have some listening exercises before they are born, and it is natural to have good listening perception after birth. In fact, babies are more sensitive to some sounds with very high frequency and very low frequency than adults. Confusingly, after infancy, children's hearing ability of extremely high frequency and extremely low frequency gradually declines. I hope my answer is helpful to you, and I wish the baby a healthy growth.