Mother speech

Child speech skills

Direct to infants

Characteristics

Child age

Characteristic

Correlation

3 m

Stress vowel duration

1 y

Babbling

0.621*

First words

0.620*

Imitation-1 y

0.816**

2 y

Imitation-2 y

0.634*

3 y

Retelling mother’s

0.654**

6 y

Picture description

0.655**

12 m

Stress vowel duration

5 y

Replica-one word

0.677**

6 y

Reading

−0.707**

Phrase pitch values

(F0_max - F0_min)

7 y

Replica-complex phrase

−0.715**

Replica-one phrase

0.677**