Suckling (noun)

1. A young animal that is still nursing from its mother.
2. An infant or very young child who is still breastfeeding.

Origin:

From the middle english word "suckle", from old english "sucelian" meaning to suck.

Examples:

1. The mother pig was caring for her suckling piglets.
2. The mother cow was making sure her suckling calf was getting enough milk.
3. The baby was a suckling, still breastfeeding from his mother.
4. The suckling was too young to eat solid food.
5. The suckling piglets were removed from their mother to be raised for pork.