firstlings

/F ER1 S T L IH0 NG Z/
noun
  1. 1

    The first produce or result, notably firstborn offspring.

  2. 2

    The first of a class or kind.

  3. 3

    The thing first thought or done.

Source: https://en.wiktionary.org/wiki/firstling, https://en.wiktionary.org/wiki/firstlings