Evidence consistently shows that motor development and language development are positively correlated rather than inversely related. Children with better motor skills typically demonstrate better, rather than poorer, expressive and receptive language abilities.
The retrieved literature consistently demonstrates positive correlations and predictive relationships between motor development and language development (e.g., fine and gross motor skills predicting expressive and receptive vocabulary). None of the papers support the idea that increased motor development occurs at the expense of speech development; instead, they show these developmental domains progress together.