After a child has a generalized seizure, what should be the nurse's priority action?

Maintaining the child in a side-lying position after a generalized seizure is the appropriate priority action because this position helps to ensure the child's airway remains clear and reduces the risk of aspiration. Children may experience altered consciousness and are at risk of inhaling secretions or vomit if they are lying flat on their back. The side-lying position also facilitates drainage from the mouth.

While other actions, such as reorienting the child or loosening restrictive clothing, are important for the overall care following a seizure, they can wait until the immediate safety concerns regarding airway management are addressed. Documenting the time and characteristics of the seizure is also crucial for medical records and further assessment but is not as urgent as ensuring the child's safety in the immediate aftermath. Therefore, the side-lying position is the critical first step to prioritize.