What Causes Atrial Septal Aneurysm In An Infant?

hi Doc, My baby (17 days old, weigh 4kg now - he was born 3,7kg) has Congenital Heart Disease. The Electrocardiograph report done when he was 2days old showed: - Presence of a moderated sized patent arterial duct with bidirectional shunting (mainly left to right) - Small to moderated sized perimembranous inlet VSD with septal aneurysm - Double secundum ASD with left to right shunting. -Mild tricuspid regurgitation and mild mitral regurgitation - Fast flow across right and left pulmonary arteries were noted. - Reassessment in one month age is recommended. He was born healthy just like normal baby. Doctor has found heart murmur on the 2nd day and suggested me to do echo of his heart (and i did as reported above). A ped cardiologist just suggested me to obsenrve and have another scan in a month time. To my observation, he started to develop symptoms such as sweating while nursing as well as hard breathing since day 8 (until now). And I have googled around that his disease is also called AVSD which is strongly associated with Down Syndrome. He, though, looks psychically fine to me (at least his face looks normal to me). Is my assumption of the down syndrome true enough? I have made my own physical examination to my son and found that he has got of the physical symptoms of having DS (small ears, gap between toe and second finger and probably low muscle tone). How can you help me in my uncertainty. I am really stressed of this situation. Thank you Doc