my 5yr 3 month old girl's weight is 13.4kg. She eats well but weight is not gaining. What's the reason? need to do any tests?

A. It could be due to digestion related issue constipation or most commonly what is seen deficiencies in the body can lead to the situation I suggest you please consult your doctor and put your child into swimming or any such activity which will help in breaking the stagnant pattern and will help it overall development and growth of your child