WOW - I just looked at your pictures and you need to have genetic testing done on both your son and daughter - My 4.5year old has a clinical diagnosis of VCFS (she has the symptoms - but the deletion is not showing up on testing - so it is either a partial deletion or a mosaic deletion) The ears on both your kids are classic 22q.11. Your daughters heart defect is very common with the deletion as is the kidney issue in your son. Also watch for Palate issues.
My DD had a submucus cleft palate, minor heart defect (no repair needed... yet

) hypertolism, ear issues, immune issues, gross motor delays.and a number of more minor "symptoms". My DD is starting to "grow out" of alot of her issues, which is common in VCFS - at about 4 the kids just kind of "burst" growth, health and development wise.
And as for thinking of FAS, for the longest time they where convinced that my DD was Autistic - she isn't, but the thearapy that she was given worked really well because she still needed it.