suckling

/S AH1 K L IH0 NG/
noun
  1. 1

    An infant that is still being breastfed (being suckled) by its mother.

  2. 2

    A young mammal not yet weaned and still being fed milk by its mother.

verb
  1. 1

    To give suck to; to nurse at the breast, udder, or dugs.

  2. 2

    To nurse; to suck milk from a nursing mother.

  3. 3

    To nurse from (a breast, nursing mother, etc.).

Source: https://en.wiktionary.org/wiki/suckling