If it's too big to pass through it's the right size for your little one.
A pediatrician and mom, Dr. Orajiaka says a simple toilet paper tube can help parents determine if a toy is a choking hazard for kids under 3. If it fits through the tube it could also fit in a child's throat and pose a choking hazard.
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Check out more tips from Dr. Orajiaka on Motherly.