Etymology

toddlerhood

todd·ler·hood
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Today it means: The period of one's life in which one is a toddler (“a young child who has started walking but not fully mastered it, typically between one and three years old”). Full definition →

First used early 20th c.
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The story

From toddler + -hood (suffix forming nouns denoting conditions or states of being).

First known use, by meaning

  • from early 20th c. The period of one's life in which one is a toddler (“a young child who has started walking but not fully mastered it, typically between one and three years old”).

Etymology from Wiktionary, CC BY-SA 4.0.