A pair means two similar things, often used together, or two people or animals. An example of a pair is two sneakers, one for the left foot and one for the right foot. 

Ask your child, “Can you tell me which parts of your body come in twos?” 

They might list feet, hands, eyes and ears. You can explain, “If you have two things that look the same, they make a pair. So, you have a pair of eyes, ears, hands and feet.”

Things that are associated with those parts of the body also come in pairs.

We have developed for you a few matching activities that have simple rules. After your toddler understands the basic concept of matching, introduce them to more complex sorting and matching games, such as matching pictures or numbers.