As its vocabulary grows the process is speeded up.
This was a day when the child's vocabulary grew.
"Their vocabulary is growing rapidly ... and they are learning a lot about life in the States."
For example, girls tend to talk earlier than boys, and in the second year of life their vocabularies grow at a faster rate.
As a child's language and vocabulary grows, they may struggle to locate a particular word or sound.
Newspeak, indeed, differed from most all other languages in that its vocabulary grew smaller instead of larger every year.
As his vocabulary grew, so did his family's dependence on him.
His vocabulary grew and the range of his mental processes expanded.
Communication was getting easier as a basic vocabulary grew.
As the course went on, my vocabulary grew from the simple to the relevant.