My four year old son has lost a lot of weight and is not eating well. He is otherwise very active and playful. Should I take him to the doctor?

if you think your child has lost a lot of weight then you should definitely check with the doc. even if he is active and playful, the doctor will be able to check why the weight loss is happening and if it is a cause for concern. in the meanwhile, try giving your child healthy food in different visually appealing ways.