Babies can understand their own names at 6 to 7 months and gradually understand adult speech, but the exact time is related to the baby’s own development. Babies usually around 6 months will respond to their own names, when someone calls the baby’s name, the baby will make the action of turning his head to find the source of the sound, with the growth of the age of the month, the baby’s knowledge of the outside world continues to increase, to 8 ~ 10 months, babies can understand some simple repetitive vocabulary, such as “goodbye” “Cuddle” and “Don’t”. At the age of 1 year, babies will have their own any and ideas about things around them and can understand sentences composed of simple words. Usually, when parents talk to their babies often, the sooner the babies can understand adult speech. If the baby cannot understand adult speech at the age of 1.5~2 years, there may be problems such as intellectual disability, hearing impairment and autism, etc. It is recommended to consult a doctor in time to find out the cause and give targeted treatment or therapy.