Your baby will probably be able to roll over when he's about six months or seven months, when his neck and arm muscles are strong enough. Some babies manage to roll over as early as three months, but other babies take longer than seven months. Your baby may take you by surprise by suddenly getting the hang of rolling over. This is why it is so important never to leave your baby unattended when changing his nappy on a raised surface.
The box turtle is the only species that spends most of its life on land and hibernates in the soil; the rest hibernate underwater. Many turtles have very long lifespans! Box turtles can live well over 100 years and other turtles like the spotted turtle can live over 50 years. Because turtles live so long, it is not so important that they produce many offspring every year. In fact, most turtle eggs or the hatchlings are eaten by birds, foxes, or other predators.
Most subspecies of Box Turtle can live close to a hundred years in the wild. Very few Box Turtles reach this age in captivity, due in part to the stress of being taken from their home environment. Since Three Toed Box Turtles are not as attached to their birth environment, they are able to live more happily in captivity than other subspecies. It is possible that a pet Three Toed Box Turtle will live longer within your artificial enclosure than a different type of Box Turtle, but a hundred year life span is still unlikely. Their exact lifespan in captivity varies immensely from one owner and specimen to another.