Home and Community Use of a Suspension Walker in Pre-Walking Infants With Down Syndrome

The goal of this clinical trial is to learn if pre-walking infants with Down syndrome can use a suspension walker in their home and community environments. The main questions it aims to answer are: * Is suspension walker intervention feasible for pre-walking infants with Down syndrome? * What are barriers to successfully using suspension walkers in home and community environments? * What are facilitators for successfully using suspension walkers in home and community environments? Participants will: * Use a suspension walker in the home and community for a three-month period (goal 20 minutes/day, 5 days/week) * Meet with a therapist three times in their home to learn how to use the walker * Track how often they use the walker for one week each month * Complete assessments of infants' gross motor skill and ability to use the walker before and after the three-month period * Be interviewed after the three-month period about their experiences using the walker