Ensuring a comfortable fit involves several steps: 1. Accurate Measurements: Regularly measuring the child to ensure that clothing and devices are appropriate for their size. 2. Material Consideration: Choosing materials that are soft, breathable, and hypoallergenic to avoid skin irritations. 3. Adjustability: Opting for adjustable equipment that can grow with the child. 4. Feedback: Regularly asking the child for feedback on comfort and making necessary adjustments.