Highchairs having enhanced safety and ease of use features are disclosed, thus allowing the highchairs to be particularly well-suited, for example, for use in a hospital or similar facility. The features make it easy to consistently place a child in the highchair in the exact same position, removing a variable such as the person putting the child in the highchair or using a haphazard approach of stuffing pillows, blankets, etc. around the child to achieve a desired position. The disclosed features include deployable cushions, multi -degree of freedom adjuster having programmable and / or programmed settings, seat bases that can be both slid and rotated, easily adjustable straps, headrests, footrests, and trays, and configurations that enable multiple highchairs to be nested together for compact storage.