Muscle Repair. The process of muscle repair depends on the availability of amino acids, and understanding the sequence of events can help clarify why dietary protein is necessary. Whatever the degree of injury to your muscle, trauma to the fibers begins a series of actions to rebuild the damaged tissue.
Typically, babies begin sitting up between 4 and 7 months, Dr. Pitner says. You can help your cutie learn this skill by holding on to her arms when she's on her back and gently pulling her up to a sitting position. She'll enjoy the back-and-forth motion, so add some fun sound effects to make it even more exciting.
We all enjoy time spent lying down and relaxing. But too much of it gets old fast -- even for babies! Sitting up allows babies to be more independent and to explore their environment in a new and exciting way, says Sheryl Pitner, M.D., assistant professor of pediatrics at the University of Nebraska Medical Center.