The following are health and medical definitions of terms that appear in the Lung Cancer article. Abdomen: The belly, that part of the body that contains all of the structures between the... See the entire definition of Abdomen. Abdominal: Relating to the abdomen, the belly, that part of the body that contains all of ...
Head and neck muscles are the first to come under a baby's control. Muscle control moves downward, toward the feet. Babies typically roll from tummy to back first beginning at around 4 months of age and then back to tummy around 6 months of age, according to the A.I. DuPont Hospital for Children.
These movements are necessary for rolling over and crawling. By the end of this period, babies should be able to roll over from stomach to back and back to stomach and probably are able to sit without any support. By age 4 months, babies can easily bring toys to their mouth. They use their fingers and thumb in a claw-like grip to pick up objects. Because at this age babies will instinctively explore objects by putting them in their mouths, it is important to keep small objects out of reach to prevent accidental swallowing.