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 soothing effect on babies. After six months of age or more, infants begin to resist being placed in cradleboards more vigorously as they become more mobile, and they are often placed in the cradleboard with their arms and hands free, so that they can play with objects hung from the cradleboard for their amusement.