Birth to 5 months
Makes sounds of pleasure and displeasure (laughs, giggles, cries, or fusses)
Makes noise when talked to
6 to 11 months
Babbles (says "ba-ba-ba")
Says "ma-ma" or "da-da" without meaning
Tries to communicate by actions or gestures
Tries to repeat your sounds
Says first word
12 to 17 months
Answers simple questions without speech
Says 2 to 3 words to label a person or object (pronunciation may not be clear)
Tries to imitate simple words
Vocabulary of 4 to 6 words
18 to 23 months
Correctly says most vowels and n, m, p, h, especially in the beginning of syllables and short words; also begins to use other speech sounds
Vocabulary of 50 words, pronunciation is often unclear
Asks for common foods by name
Makes animal sounds, such as "moo"
Starting to combine words, such as "more milk"
Begins to use pronouns, such as "mine"
Uses 2-word phrases
2 to 3 years
Knows some spatial concepts, such as "in," "on"
Knows pronouns, such as "you," "me," "her"
Knows words to describe things, such as "big," "happy"
Uses 3-word sentences
Speech is becoming more accurate, but may still leave off ending sounds; strangers may not be able to understand much of what is said
Answers simple questions
Begins to use more pronouns, such as "you," "I"
Raises pitch when asking for something, such as "my ball?"
Begins to use plurals, such as "shoes" or "socks" and regular past tense verbs, such as "jumped"
3 to 4 years
Groups objects, such as foods and clothes
Uses most speech sounds, but may distort some of the more difficult sounds, such as l, r, s, sh, ch, y, v, z, th and these sounds may not be fully mastered until age 7 or 8
Uses consonants in the beginning, middle, and ends of words; some of the more difficult consonants may be distorted, but attempts to say them
Strangers are able to understand much of what is said
Able to describe the use of objects, such as "fork," "car"
Has fun with language; enjoys poems and recognizes language absurdities, such as, "is that an elephant on your head?"
Expresses ideas and feelings rather than just talking about the world around him or her
Uses verbs that end in "ing," such as "walking" and "talking"
Answers simple questions, such as "What do you do when you are hungry?"
4 to 5 years
Understands spatial concepts, such as "behind," "next to"
Understands complex questions
Speech is understandable, but makes mistakes pronouncing long, difficult, or complex words, such as "hippopotamus"
Uses some irregular past tense verbs, such as "ran," "fell"
Describes how to do things, such as painting a picture
Lists items that belong in a category, such as animals and vehicles
Answers "why" questions
Understands time sequences (what happened first, second, and third)
Carries out a series of 3 directions
Can carry on a conversation
Sentences can be 8 or more words in length
Uses compound and complex sentences
Uses imagination to create stories