You could go on a shape hunt to see how many circles, squares, rectangles and triangles your child can find, for example square windows, circular plates, and rectangular posters. You could look for patterns too.
Talk about the shape and size of objects (e.g. big car, little car, round ball, square table, rectangular book) and ask your child questions such as ‘Can you pass me the biggest box?’, or ‘Which one is the smallest shoe?’.
Play with blocks and encourage your child to think about size, colour and shape. Also play with containers and ask, ‘How many socks can you fit in the box?’, ‘Which container holds the most (or the least) sand/water?’.