Let your baby handle and explore the different shapes.
Show your baby what each shape does - i.e. roll and squeak the ball, jingle and rattle the shapes.
Move the different shapes and let your baby try.
Play peek-a-boo with the mirror shape.
Encourage your infant to move/rattle/wind the shapes and listen to the different sounds - talk to your little one about the different noises they make.
Roll, twist, push, shake, squeeze!
9+ months
Show your little one how to stack the shapes correctly. Be enthusiastic about successful stacking e.g. "Look, a tower!"
Encourage your baby to knock them over and try again without too much help from you.
Have some fun! Stack them in the wrong order and watch them fall over. Always use supportive and upbeat language; "well done, what a clever boy, whoops, it fell over, lets try again"
12+ months
Encourage your child to name and recognize different colors and shapes - use the correct vocabulary for simple 2D shapes - for example: blue circle, red square.
Always encourage and recognize successful stacking to help your child gain a sense of their achievements.