Hypomelanosis of Ito (I diagnosed this one!)
Congenital adrenal hypoplasia (not hyper)
Diabetes insipidus (nephrogenic)
Congenital Central Hypoventilation Syndrome (Ondine's Curse)
Hypoplastic Left Heart Syndrome (in my NICU time)
4 umbilical hernias in 1 day (apparently they are more common here than elsewhere in the country.)
Bonus points for the readers who at least look on Wiki what these things are.