An 11-month-old girl is noted to have blue lips and some fat…

An 11-month-old girl is noted to have blue lips and some fatigue after running around the room for as little as 4 minutes. The mother reports an uncomplicated, normal delivery. However, as the family has recently immigrated from Mexico, and she has not been evaluated by a doctor or NP in the past. Which of the following is the most likely diagnosis?