Don't worry, it's quite common to see this symptom in the child. Several reasons might lead to this situation. The ordinary cause is drinking too much before go to bed. Owing to the sleep, there is a fewer amount of activity , at the seem time, a slower process of metabolism we will have, which eventually give a rise to a puffy eyes in the morning . Meanwhile, an eye allergy can also explain this symptom. An allergic reaction can occur while we are in contact with allergens such as pollen, dust, mold, animal hair and another substance. However, kidney is the essence of a puffy eyes. So just take your child to the hospital to have a physical examination if he don't feel better after massaging his eyes with fingers or changing everything he always gets in touch.