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2 Months
At 2 months old, infants begin to coo and make pleasant vowel sounds. -
4 Months
At 4 months old, infants are curious to observe turn-taking games such as peekaboo. -
6 Months
At 6 months old, infants start to babble which adds consonants to their cooing sounds and repeating syllables. They also begin to comprehend a few commonly heard words. -
7 Months
At 7 months old, infant babbling starts to include many sounds of languages. -
12 Months
At 12 months, babbling adds in sound patterns heard in the community, speed and accuracy of word comprehension increase, and the infant says his/her first word. -
8-12 Months
Infants become better at getting attention of the caregiver, actively participate in turn-taking games, and use preverbal gestures such as pointing and showing to influence others. -
18-24 Months
Between 18-24 months, an infant's spoken vocabulary grows from around 50 to 200 to 250 words, he/she combines two words, and can use pronouns. -
3 Year Olds
3 year olds use complete sentences, use 900 words but understand more, and recognize common objects in pictures. -
4 Years Old
A four year old can tell stories, use prepositions, plurals, and compound sentences. -
5 Years Old
A five year old asks the meaning of words. -
6-12 Years Old
By age six, the child has acquired around 10,000 words and by age twelve it's around 50,000. Incomplete sentences decline from the child's vocabulary and he/she can identify left and right.