Yes, Lax-A-Day can be given to a 22-month-old child who is often constipated. The recommended dose is 1 gram of powder per kilogram of the child's weight, diluted in a small amount of any liquid and given once a day as needed. It is important to also ensure the child is drinking plenty of fluids and eating fibrous foods like fruits, vegetables, and whole grains to help keep their stools soft. Additionally, regular physical activity can also help with regular bowel movements at this age.