My son is 4 year 4 month old. His weight is 14.30 kg. Is it normal?? How can I gain weight?? I tried a lot things(smoothie, butter, potato, ghee) but no result. What I do??

A. weight is in normal range.. Give well balanced diet including all five healthy food groups: vegetables, fruit, grain foods, dairy and protein. also gi e warm water to boost digestion.