The short answer
Speech recognition is still much less accurate with children’s voices than with adults’. So treat the app’s feedback as encouragement, not a verdict: keep lines short, practice in a quiet spot, cheer the effort yourself, and choose apps that limit retries and move on instead of repeating “try again.”
Research comparing speech recognition across age groups found higher error rates for children than adults; results vary by dataset and system (published review). An app mishearing a child is not a measure of that child’s reading.

