toddler

toddler トﾀﾞﾗｧ-  n)よちよち歩きの幼児　2〜4才児程度

a toddler playground  幼児の遊び場

a toddler car seat = child safety seat  チャイルドシート

high chair 幼児用の食事椅子

For example, when a baby starts to walk, they enter a new season, where they're no longer a "baby", they are now a "toddler".

season n)季節、時期

Many toddlers go through a season known as the "terrible twos", because it usually starts around the age of two.

go through 通り抜ける、経験する、くぐりぬける

As a result, the researchers suggested that it might be a good idea to limit TV time for babies and toddlers.