“…Research on developmental speech production takes a somewhat indirect approach to examine the role or effect of production on learning—in other words, production is typically not a controlled factor. Evidence is emerging that production‐based representations exist even before infants produce meaningful speech (Bruderer, Danielson, Kandhadai, & Werker, ; DePaolis, Vihman, & Keren‐Portnoy, ; DePaolis, Vihman, & Nakai, ; Majorano, Vihman, & DePaolis, ; Ngon & Peperkamp, ; Yeung & Werker, ). In addition to observing that there is a relationship between infants’ babbling repertories and their first words (Vihman, Macken, Miller, Simmons & Miller, ), children are more likely to add words to their productive vocabulary when the words are shorter in word length, have more phonological neighbours (i.e., words that sound similar to many other words), and are more frequent (Carlson, Sonderegger, & Bane, ; Coady & Aslin, ; Maekawa & Storkel, ; Ota & Green, ; Stoel‐Gammon, ; Storkel, , ).…”