3 months Recognizes familiar voices.
4 months Turns head to voice.
5 months Reacts to environmental sounds: Reacts to sounds other than voices.
6-9 months Understands “no”, anticipates events, understands some phrases (give kiss), Understands object
12 months Recognizes names of common objects, familiar people, and action verbs.
15 months Responds to simple requests and follows one step commands without gestures.
18 months Identifies pictures in a book, points to body parts, and uses objects appropriately in play.
2 years Understands approximately 300 words, listens to simple stories, responds to yes/no and simple “wh”
questions, and able to follow two step commands.
3 years Understands use of objects, understands the concept of turn taking, able to identify parts of of objects understands simple descriptive adjectives, understands pronouns, comprehends approximately
500-1000 words, knows difference between sexes and own sex, knows simple spatial concepts
(in/on/under), able to match and identify colors, understands some quantity concepts (one, all).
4 years Identifies categories, makes inferences, understands analogies, correctly identify colors,
and understand “more” and “most”.
5 years Understands time and qualitative concepts, understand “-er” as “one who does
something”, and answer simple questions about a story. Letter and number recognition emerging
or present. Able to understand 95% of what is said to them.
6 years Identifies items that don’t belong, able to order pictures from largest to smallest, and understand
passive voice tense.
3 months Cooing: Early vowel sounds a baby makes. (oohs and aahs)
4 months Laughing: Laughs or giggles when stimulated by silly faces and tickling.
5 months Razzing/raspberries: A great oral exercise your baby engages in possibly to gain attention.
6 months Babbling: When baby combines consonants and vowels. (da da da or ma ma ma)
7-9 months Protests: Protests when a toy is taken away.
10 months Mama/Dada meaningfully: Baby relates “mama” and “dada” with the caregivers
12 months Uses anywhere from one to three words.
18 months Strings together many sounds, adds intonation and gestures, imitates some words and
begins to try to communicate with more words than gestures.
2 years Joins words into two word phrases such as “more drink” or “bye mama”, asks questions with
rising intonation, responds to yes/no questions, uses approximately 50 words, labels familiar
objects by name produces animal sounds, identifies self by name,talks to self while
playing, and is approximately 65% intelligible to an unfamiliar listener by age two.
2½ years Begins to use short 3-4 word phrases. Meaningfully uses 200 words. Able to identify actions in pictures
Able to identify the use of some objects. Answers: Answers simple “wh” questions logically.
Able to use plurals and simple prepositions (in and on).
Approximately 70% intelligible to an unfamiliar listener.
3 years Have a vocabulary of approximately 1000 words and be about 75% intelligible.
Pronouns: Uses pronouns appropriately.
Answer more complex “wh” questions logically. (who, why, where, how)
Articles and Auxiliaries present: “the” and “a”, and “is” “am”
3½ years Name pictures in a book, tell how an object is used, and use possessives. Able to use possessives and irregular past tense verbs.
4 years Be about 95% intelligible, even to unfamiliar listeners.
4½ years Respond to “where” questions and complete analogies. Approximately 95% intelligible to unfamiliar listeners. Able to use regular past tense verbs.
5½ years Repeat sentences, use adjectives to describe objects, use past tense forms of verbs (-ed),
and describe similarities. name categories and complete analogies
6½ years Define words, rhyme words, and repair grammatical errors.tell a story in sequence, repairs errors, and expresses quantity.