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.
Typically, babies start sitting at 6 months, but this should not be taken literal, but as a ballpark. So babies that sit near 5 months through 7 months, this is OK. If your baby is sitting early, I would also ask, is your baby rolling over because, with back to sleep, (which is a MUST!) and babies are not going on their belly as much, some babies HATE to be on their tummies and would prefer to sit.