also: はつまご
first grandchild
Refers to the first grandchild born into a family, often a momentous occasion.
両親は初孫の誕生をとても喜んだ。
My parents were overjoyed at the birth of their first grandchild.
Standard kanji spelling; the reading ういまご is the most common.
Alternate reading; less common but still used.
Compound of 初 (first) and 孫 (grandchild).