Treadmill Technical Information We used specially designed infant- sized treadmills that cost us approximately $1,000 each to build. While any treadmill can be used, certain restrictions do apply to a treadmill's belt speed in order to accommodate use by an infant. The belt speed must be able to operate at a speed just under ½ mile per hour. The speed we used with our infant-sized treadmills was 0.46 miles per hour (0.2 meters per second). Some parents have purchased inexpensive adult- sized treadmills at stores such as Walmart, Service Merchandize, and The Sports Authority that have met these speed requirements. For information on ordering the specially designed infant-sized treadmills, contact Sam Carlin at scarlin@voyager.net.