<P> Around 2 Months babies can distinguish between different speech sounds, and can make "goo" ing sounds </P> <P> Around 3 Months babies begin (making elongated vowel sounds "oooo" "aaaa"), and will respond vocally to speech of others . They continue to make predominantly vowel sounds . </P> <P> Around 4 Months babies may vary their pitch, and imitate tones in adult speech . </P> <P> Around 5 Months babies continue to experiment with sound, imitating some sounds made by adults . </P>

Which of the following is true of the development of babbling