年とし弱よわ

na-adjective, noun

child born in the second half of the year

Refers to a child born between July and December, often in contexts like school year cutoffs or age-group sports. The term is somewhat niche and may not be widely known outside specific communities.

• 年とし弱よわの子こは同どう学がく年ねんの中なかでも体からだが小ちいさいことがある。

  Children born in the second half of the year may be physically smaller among their grade.

• 彼かれは年とし弱よわだから、まだ6歳さいだけど来らい年ねん小しょう学がく生せいになる。

  Because he was born in the latter half of the year, he is still six but will start elementary school next year.