Today is baby pig's birthday, so she bought a beautiful doll for him.

今天是猪宝宝的生日，所以她给他买了一个漂亮的娃娃。

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The baby sickened and died before his first birthday.

婴儿没过周岁就病死了。

《牛津词典》

We were told first babies rarely arrive on their due day, they can be early and late so we never thought for a moment that the baby would be born on mine and my dad's birthday.

我们被告知第一胎婴儿可能不会按预定的时间出生，或早几天或晚几天。 但是我们怎么也没想到孩子居然在我和父亲生日这天出生了。

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She has denied assault and battery of Rehma Sabir on 14 January, the baby's first birthday.

BBC: Irish nanny denies assaulting baby in Boston

Goerman, who'd owned the Student Prince for fifty years, brought up platters of creamed whitefish and several bottles of Rhine whine and we toasted the birthday of the baby Jesus, and all in all, this might have been our happiest time.

NPR: Chapter 1

His mother Mary Ann, 79 years old, a leap-day baby who will celebrate her 20th birthday next Wednesday, suggested the idea in 1988.

WSJ: For Some, All in a Leap Day's Work