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What's the Difference Between Baby, Newborn, Infant & Toddler?

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Mother and two daughters (20 months-3) lying on bed, smiling.
Stuart Westmorland/The Image Bank/Getty Images
Question: What's the Difference Between Baby, Newborn, Infant & Toddler?
Answer: On this site, the word baby means any child from birth to age 4. Newborn refers to babies under three months of age. Infants are babies from three months to one year old. Toddlers are babies from one year to four years of age.

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