Few pediatric heart diseases can also leads to breathing difficulty. Generally we thought that in children, difficult breathing is mainly due to lung problems but it is not so.
Examples of pediatric heart diseases are Large AP window, VSD, AVSD, Truncus, TGA- VSD etc.
In these congenital heart diseases, there is an excess blood flow to lungs circulation which leads to fluid leaking into lungs itself that results in labored breathing.
So, we should keep in mind about the possibility of heart diseases also when the child is having difficulty in breathing.
Please refer to common cardiac condition section of www.childrenheartcare.com for detailed description of these diseases.