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An alert toddler in a sleep sack stands in a bare crib while a caregiver kneels nearby with a bedtime book and softly glowing clock

21-Month Sleep Regression? What to Do Tonight

A sudden sleep change at 21 months is not proof of a fixed regression. Check illness, pain, breathing, hydration, and crib safety first. If your toddler seems well, keep the routine familiar and change one variable at a time.