Children may have a lack of muscle control that prevents them from being understood when they speak, leading to frustration and socialization problems. (grayandwhitelaw.com)
This is because your baby's development at this stage means inadequate muscle control in the neck to hold up the head. (stroller-envy.com)
For instance, someone with multiple sclerosis, an autoimmune disease, who is sensitive to chemicals may lose muscle control of her legs when exposed to perfume. (functionalhealthnews.com)