toddlerhood

noun

1. (uncountable, usually)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”).

   “We’ve been friends ever since toddlerhood.”

   “[T]he stage at which mother showed herself to her infant in her true colours was whilst breast feeding was still going on, and any difficulties that belonged to toddlerhood had their roots reaching back to this stage.”

   “And, like most boring mothers, I fret about schools. Where I grew up, everyone went to the nearest village primary school and the local comprehensive. But here, since the earliest days of Isobel’s toddlerhood, my friends and acquaintances have been engaged in an arms race.”