Although younger infants may babble and imitate speech sounds,such as "dada," in general most infants are able to say "mama," "dada," and one other word by which age?

Question

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At 8 to 10 months of age,most infants are able to say "mama," "dada," and one other word.
Infants 6 to 8 months old can babble vowel-like sounds,"ooh," and "aah"; imitate speech sounds ("mama" and "dada"); and laugh aloud.Infants 10 to 12 months old understand "no" and other simple commands; say one or two other words; imitate speech sounds; and speak gibberish.At 12 to 15 months,they can say four to six words.

Although Younger Infants May Babble and Imitate Speech Sounds,such as "Dada