snowflake baby

noun

1. informal.
   a baby born following the transfer of a surplus embryo produced during the in-vitro fertilization of one woman to the womb of another woman who was not a cell donor

Example Sentences

Another is the Snowflakes Embryo Adoption programme, run by the Nightlight Christian Adoption Agency, which has led to the birth of more than 400 children, and helped introduce the term "snowflake baby" into the lexicon, as a way of referring to someone born in this way.

From BBC