rainbow baby       
noun [ C ] uk/ˈreɪn.bəʊ ˌbeɪ.bi/ us/ˈreɪn.boʊ ˌbeɪ.bi/
 彩虹宝宝
a baby that is born after the previous death of a baby, a stillbirth (= birth of a dead baby), or a miscarriage (= an early unintentional end to a pregnancy)
  It is common for parents of rainbow babies to experience conflicting emotions. 对于彩虹宝宝的父母来说经历复杂矛盾的心情是很常见的。 
 See also: rainbow pregnancy
 - More examples
- Welcoming a rainbow baby can be emotional for parents.
- Rainbow babies usher in light after a period of darkness.
- Grace, our little rainbow baby, was born the following year.