Measure Up! Cups or Measure Up! Pots & Spoons, or three different sizes of plastic (so they won't break) cups or glasses. Let your child experiement to see which cup will fit inside the other ones. See if they can stack them by size. If you have some baby shoes or doll shoes, and your child's own shoe, see if your child can figure out which shoe will fit his or her foot, and which shoe will fit inside the other. If you can, get different sizes of boxes or other items that will fit inside each other.
If you would like other suggestions on how you can teach size, please email me.
Educational Leader, Discovery Toys