noun
physically weak or sickly child
Refers to a child who is constitutionally frail or in poor health. Often used in medical, educational, or social welfare contexts.
虚弱児のために特別な健康管理が必要だ。
Special health management is necessary for physically weak children.
彼は幼い頃、虚弱児として扱われていた。
When he was little, he was treated as a sickly child.
虚弱体質 describes a constitutional weakness or frail disposition, not limited to children.
Compound of 虚弱 (physically weak) and 児 (child). The exact historical derivation is uncertain, but the term is conventionally used in medical and social contexts.