been used in cultures ranging from the sub-Arctic regions of present-day Canada, down to Mexico and Central America. In Arctic regions, cold weather does not make a cradleboard feasible for the infant's survival, and infants are carried by being placed in a sling worn under the mother's parka. Cradleboards were widely used by indigenous people across present-day North America. Cradleboards are used by the Kickapoo people in Mexico and were used by Aztecs and the Seri people and Mayan communities as far south as Belize. In present-day South America, most indigenous cultures used slings or pouches, sometimes called a rebozo, for carrying infants rather than cradleboards. Cradleboards were used as in the Americas as far south as the Patagonia region. Cradleboards were used during periods when the infant's mother had to travel or otherwise be mobile for work, and needed to protect the infant. The cradleboard could be carried on the mother's back, using support from "tumplines", or "burden straps" that would wrap around her forehead, chest or shoulders; if she carried a pack as well as the cradleboard, the pack strap would go around her chest and the cradleboard strap would go around her forehead. The cradleboard can also be stood up against a large tree or rock if the infant is small, or hung from a pole (as inside an Iroquois longhouse), or even hung from a sturdy tree branch. They were also used when longer travel was required, as the cradleboard could be attached to a horse for transportation. In the southwest United States and northern Mexico, among cultures such as the Hopi and Apache, infants would spend most of their day and night in the cradleboard, being taken out of it for progressively longer periods, for up to five times per day. When the infant reaches the age when it can sit up unsupported, it is then gradually weaned from the use of the cradleboard, and spends progressively less time in it. At this time, the infant may use a second, larger cradleboard that replaces the first. By the time the infant is a year old and begins to walk, they are generally finished with cradleboard use. Cradleboard use and its effect on mother-infant interaction has been studied in Navajo communities. It has been shown that cradleboard use has no significant negative effect on this development. In the first few months of infancy, cradleboards have a