Yes, you can give Gravol for motion sickness to a child weighing 32 lbs. The recommended dose is 1.25mg per kilogram of body weight, which would be around 18mg of Gravol. In liquid form, this would be approximately 5mL of the syrup. It is important to administer the dose 30 to 45 minutes before traveling. Keep in mind that there is a possibility of a paradoxical reaction, where instead of being sedated, the child may become agitated.