One glance, one answer
The home screen leads with a single status: stable, or something needs attention. A parent opening the app at 2am, one-handed, holding the child, gets the one thing that matters first, before any of the supporting numbers. The status card is tappable and takes them straight to whatever raised it, whether that is an out-of-range lab, a logged symptom, or an ongoing hospital stay.
Below it, the child's age, the count of currently abnormal labs, and whether a hospitalization is active. Two quick actions, add a lab result and note a symptom, are always one tap away because logging has to be fast enough to do mid-interruption.