It is generally OK for your toddler to sleep with a pillow after they turn 2. Learn more in this article.
Pillow Use in Children – At what age should I introduce a pillow
When to Introduce a Pillow - The Sleep Store NZ
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Infant Sleep Safety Spartanburg Regional
Toddler Pillow with Pillowcase - 13x18 My Little
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Toddler pillow safety: Addressing and preventing potential risks
When Do Kids Need a Pillow? – Happiest Baby
Helping Babies Sleep Safely
When Can Your Baby Sleep With a Pillow?
When Can Your Baby Sleep With a Pillow or Blanket?
Should my baby/child be sleeping with a pillow?