My son's height is 152 cm and weight 37 kg and age 16 yrs. what are some ways for him to grow taller and gain more weight?

See Nutritionist: His pediatrician should recommend a good nutritionist for him. A BMI of less than 18 is considered underweight. A nutritionist can assess his needs, evaluate his current diet, and suggest what he can do to add additional calories and nutrients to his diet. His height is primarily decided by his genes, so his height will depend on the parents' height.