People who have normal hearing can hear a wide range of soft and loud sounds, as well as low and high pitches. People who are deaf or hard of hearing may hear some sounds or they may hear nothing at all.
Language acquisition of all children occurs gradually through interaction with people and the environment. The mother, the father and the immediate family members are the persons the baby most interacts with communicatively. This communication will determine the language development in the vital first five years. Language development should progress steadily.
Children vary quite considerably with regard to the rate at which they reach the various speech and language “milestones”, so it advisable to not have rigid expectations regarding a child’s development.
By the age of 12 months, a child can generally say one or two words with meaning and can understand simple questions. By 2 to 3 years of age a child should be able to follow two-part instructions and string two or three words together to talk about and ask for things. By the age of 4 years, a child should be talking in sentences.
A child is considered to be a late talker if they have a spoken vocabulary of fewer than 50 words at the age of 2 years.