There are various causes that lead to swelling of body in children. It may be due to heart related, due to kidneys, anemia, liver diseases etc.
Many pediatric cardiac lesions, child may go into heart failure that can results in swelling of body.
Heart diseases that leads to increase blood circulation in pulmonary circulation results in difficulty in breathing as well as swelling of body due to heart failure, an ominous sign.
In these types of diseases,patient disease should be addressed aggressively and early treatment should be given to the child.
Causes that can lead to this issue are acyanotic and cyanotic congenital heart diseases with large VSD or PDA.
Please refer to common cardiac condition section of www.childrenheartcare.com for detailed description of these diseases.