Pick a few objects around the house, and line three of them up by size from smallest to biggest. Talk with your child about the lineup. Have them turn around while you rearrange the objects. See if they can put them back into the original order and talk them through it!
See what your child is learning
Your child is using what they already know about size to line things up like this. Using what they already know in new situations, like remembering the old order after the objects are rearranged, is an important skill for school and life.