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2
2 months
At age 2 months, an infant typically begins cooing and making simple vowel like sounds. -
4
4 months
Infants begin observing social games such as peek-a-boo with interest -
6
6 months
Infants begin babbling and adding consonant sounds to already existing vowel sounds. At this age some infants may begin understanding a few common words that they hear frequently. -
7
7 months
Babbling begins to start sounding like spoken language that the infant is exposed to. -
Period: 8 to 12
8-12 months
During these months infants actively participate in social games such as peek-a-boo and pat-a-cake with a caregiver. They begin using pre-verbal gestures such as pointing and grabbing. -
12
12 months
Babbling continues and continues to include more of the sound and intonation of language the infant is familiar with. At this age, word comprehension increases rapidly. Some children may speak their first recognizable word. -
Period: 18 to 24
18-24 months
Toddlers expand their vocabulary from 50 to close to 250 words during this time. Toddlers may begin to combine words to make short sentences. -
Period: 24 to 36
2-3 years
Toddlers being to use simple sentences and start following grammar rules. The sentences start following subject-verb order. -
Period: 36 to 60
3-5 years
Children at this age being to speak in longer sentence and suse more conventions of grammar when speaking. They start holding more conversations, and can adapt their language to fit social expectations. -
Period: 72 to 144
6-12 years
Children at this age can comprehend over 40,000 words, and add more than 20 words into their vocabulary each day. Their speech should be intelligible and useful. They may even begin using slang words.