LAUSR

Ions can say a lot about a baby’s health. High levels of chloride in sweat can indicate cystic fibrosis (CF), a disorder that causes respiratory and digestive problems; abnormal sodium levels are signs of increased risk for seizure or muscle problems; and too-high or too-low potassium concentrations can cause heart arrhythmias or other muscle issues. These ions—commonly called electrolytes— are also important throughout life. For instance, too much or too little sodium can lead to confusion, seizures, and muscle weakness or cramping.