Final answer:
Toddlers commonly become unresponsive because of breath-holding spells.
Step-by-step explanation:
The age group that commonly becomes unresponsive because of breath-holding spells is toddlers . Breath-holding spells are episodes where a child involuntarily stops breathing, often in response to a trigger like pain, frustration, or fear. While breath-holding spells are more common in toddlers, they can also occur in infants and preschoolers, but they are less frequent in school-age children. It is important for parents and caregivers to understand that breath-holding spells are usually harmless and children typically outgrow them by the age of 5 or 6.