週しゅう齢れい

noun, suffix

week-old; age in weeks

Used as a noun meaning 'age measured in weeks', or as a suffix attached to a number to indicate the age of a young animal or infant in weeks. Common in veterinary, pediatric, and developmental contexts.

• この子こ犬いぬはまだ週しゅう齢れい3週しゅう間かんです。

  This puppy is only 3 weeks old.

• 週しゅう齢れい別べつの発はっ達たつ段だん階かいを確かく認にんする。

  Check the developmental stages by week of age.