Baby girl (15-18 months) sitting on bed, biting toy

Teething & Screaming in Infants

Most babies begin to teethe when they are between 6 and 8 months old, but the process can begin as early as 3 months, according to the National Institutes of Health's website, MedlinePlus. Teething can be an uncomfortable time for your baby and result in mild to moderate irritability and screaming.

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