It’s common for kids to swallow water while swimming, and coughing or spitting it out are the body’s ways of handling it. In recent years, cases of dry or secondary drowning have gone viral, alarming parents that an accidental gulp at the pool could be fatal days later. But this is not an actual medical condition, and there are no cases of children who suddenly die because they went swimming days earlier. When water gets in the airway or lungs, symptoms arise quickly. If a prolonged cough or trouble breathing develops — whether 30 minutes after you’ve been in the water or a week later, seek medical attention.