What is Prevocalic Voicing?
Prevocalic Voicing (pvv) is a phonological process typically lasting up to the age of 3 years. Pvv happens when voiceless consonants (t, k, p, s, f, sh, th, ch, h) in the initial position of a word or syllable is replaced by a voiced consonant.
Examples:
tog = dog
pig = big
chug = jug
fine = vine
cookie = guh-gee