It is often said that infants / toddlers* develop in a focused manner. I am specifically interested in the notion that a quick development of speech occurs at the expense of motor skill development and vice versa.
Is there scientific evidence that speech and motor control development are indeed competitive, in the sense that a quick development of motor control inhibits speech development, or vice versa?
Can they develop more or less in parallel as well?
*With infants / toddlers I mean normal, healthy kids between 0 and 24 months of age.