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.
Most babies accustomed to back-sleeping do not begin to roll freely until about 5 to 6 months of age, according to the SIDS and Kids website. The AAP encourages parents to give their baby supervised tummy time with their infant playing on his tummy for three to five minutes at a time, two to three times daily.