What Is It? Marfan syndrome is a genetic (inherited) disorder that affects the body's connective tissue. Connective tissue is the tough, fibrous, elastic tissue that connects one part of the body with another. It is a major part of tendons, ligaments, bones, cartilage and the walls of large blood vessels.
Your baby's first step toward mobility isn't actually a step at all -- it's a roll. When she's about 2 or 3 months old, she may flip from front to back. During tummy time (which you should supervise), your baby may lift herself into a push-up position and then start to rock back and forth or kick her feet. Then, if she's strong enough, those movements will send her rolling over.
Age 8-12 Months. By age 8 months, most babies can sit up without support. They also figure out how to roll down to their stomachs and return to a sitting position again. Some babies are in constant motion; they'll arch their necks and look around while on their stomachs and grab at their feet or objects while on their backs.