Birth to three months:
- recognizes your voice and is quiet for a moment when you speak.
- startles or jumps after a loud sound.
- stirs, wakes up, or cries when someone talks or makes a noise.
- makes sound indicating pleasure.
- looks at you, looks away, then looks at you again during playtime.
- repeats the same sounds often.
- cries differently for different needs.
- smiles when he/she sees you.
Four to six months:
- turns eyes towards an interesting sound, such as your voice.
- appears to listen, then smiles when spoken to.
- smiles or stops crying when you speak.
- awakes easily to sounds.
- notices toys that make sound.
- makes babbling noises that are more speech-like and include a variety of sounds.
- tells you by sound or gesture when he/she wants you to do something again.
Seven months to one year:
- stops or pays attention when you say "no" or call his/her name.
- moves his/her head to try to find where a new sound is coming from.
- strings of sounds such as "ba, ba, ba, da, da, da."
- understands "no" and "bye-bye."
- enjoys games like "peek-a-boo" and "pat-a-cake."
- has one or two words (bye-bye, mama, dada), although they may not be clear.
- child uses speech or non-crying sounds to get and keep your attention.
One to two years:
- gives you toys or other objects when you ask, without your having to use a gesture
- points to familiar objects if you ask
- follows simple commands and understands simple questions such as, "roll the ball," or "kiss the baby."
- listens to simple stories, songs, and rhymes.
- says more words every month
- puts two words together ("more cookie," "no juice")
Two to three years:
- understands differences between concepts such as, "go-stop," or "up-down".
- continues to notice sounds such as a ringing telephone or doorbell.
- has a word for almost everything.
- speaks understandably (to parent) most of the time.
- uses two- or three-word sentences to talk about and ask for things.
Three to four years:
- hears you when you call him/her from another room.
- hears television or radio at the same loudness level as the other people in the room.
- answers simple "who," "what," "when," "where," "why" questions.
- talks about what he/she does at school or at friends' houses.
- usually talks easily without repeating syllables or words.
- is understandable to people outside your family.
- uses many sentences that have four or more words.
Four-and-one-half to five years:
- hears and understands most of what is said at home and in school.
- is thought by others to hear them well.
- pays attention to a story and answers simple questions about it.
- communicates easily with other children and adults.
- says all sounds correctly except maybe one or two.
- uses the same grammar as the rest of the family.