Pre-treatment Information Collection Phase Before you/your child start taking the liquid, we will collect some initial information. This will include taking your/your child's weight and height. A dietitian will perform an assessment of you/your child's body composition using a tool called a caliper. This will briefly pinch the skin at the back of your/your child's arm. It will not hurt. The dietitian will also measure your/your child's upper arms using a tape measure.