While blowing up a balloon, let your child feel the balloon getting bigger, then while letting the air squeeze out, your child can feel the balloon getting smaller and listening to the sound of the air escaping.
Items could be put inside a balloon such as water (warm and cold), sand (wet and dry), small items (beads, plastic marbles, rice etc), blow up the balloon and tie a knot, follow the sounds, feel the items vibrate and hit the sides when shaken etc.
For a texture game, put items such as flour, rice, sugar, pasta or water inside the balloon. Blow the balloon up only slightly, this will allow the child to squeeze them safely without it popping, they will feel the different textures.
Want to learn how to use balloons as part of sensory play AND create a tactile piece of wall art at the same time?
BALLOON STICKY WALL SENSORY ACTIVITY FOR BABIES AND TODDLERS – hello, Wonderful (hellowonderful.co)