Hoping everything is okay

When I was pregnant my obgyn saw something funny in my sons heart so I got sent to a pediatric cardiologist and they got inconclusive results.. so after I had him they kept him the nicu for a couple of weeks doing echos to make sure he doesn’t have coarctation of the aorta, those echos also came up inconclusive so they ended up releasing him and at his 2 month appointment everything was okay hadn’t gained much weight but was okay. At his 4 month appointment he only weighed 10lbs?? And now the doctor is hearing something with his Heart and he does thing thing that looks like he’s having a seizure but him not gaining weight and the way he tenses up could all be results of a problem with his heart. We have a appointment on Thursday to see if he has coarctation of the aorta or a atrial septal defect.. I’m just hoping he’s okay.. also my son eats 8oz every 4hrs so he’s eating a good amount..

Here is a pic of my little guy: