A one year old infant typically:
Enjoys participating in social games such as peek-a-boo and pat-cake
Recognizes words for common objects
Listens when spoken to
Turns towards speaker
Imitates different speech sounds
Makes sounds to call for attention
Uses gestures to communicate (waving to greet, holding arms to be picked up)
Follows simple 1-step directions ("come here" to "Clap your hands"
Uses ten words ("baba',for bottle, "Mama"), although they may not be pronounced clearly
Responds to "give me" while holding an object
Points to two action words
Imitates 3 animal sounds
A two year old child typically:
Identifies a few body parts on themselves or others
Enjoys songs and rhymes
Attends to simple stories
Uses all vowel sounds
Points to pictures when describes
Follows 2-step commands ("Get the ball and throw it")
Understands basic questions ("where's your hat?"
Asks 1-2 words that represent different ideas together ("More cookie", "Go out", "No juice")
Has about a 50 word vocabulary
Understands the concept of "one"
Uses own name to refer to self
A three year old typically:
Attends to stories for longer periods of time
Is understood by familiar listeners 75% of the time
Requests objects by naming them
Understands opposites ("go/stop", "in/on", big/little", "up/down")
Follows three step related directions ("get the crayon, come to the table and color")
Uses 3 word phrases (on the average) to express wants and needs (i.e., "Baby eat apple")
Responds to and asks Wh-questions (i.e., who, what, where, when)
States his or her gender
A four to five year old child typically:
Recalls events about activities at school or at a friend's house
Uses sentences that, on the average, have four to five words
Enjoys playing imaginative play