On the basis of the understanding of the cellular mechanisms of thyroid hormone action on the heart and cardiovascular system, it is possible to explain the changes in cardiac output, cardiac contractility, blood pressure, vascular resistance, and rhythm disturbances that result from thyroid dysfunction.
Last updated: July 2015. Tummy time is essential from day one to help your baby grow strong â even if your baby fusses and cries when you put him on his belly. Experts find that babies who don't spend time face-down often have some delays in their development of motor skills.
1 Tummy time. 2  From the start, long before your baby's ready to crawl, give him plenty of tummy time. 3  Placing your baby on his tummy and playing with him for several minutes a few times a day while he's awake and alert will help to develop muscles that he needs to crawl.ow to help your baby crawl. 1  Tummy time. 2  From the start, long before your baby's ready to crawl, give him plenty of tummy time. 3  Placing your baby on his tummy and playing with him for several minutes a few times a day while he's awake and alert will help to develop muscles that he needs to crawl.