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Buy as big of a bucket of slime as you can (or as big of a mess as you're willing to tolerate!) and let your kid play with it! The slimy texture is great sensory input.
Just make sure not to let your child go near any carpets or rugs with the slime.
Psst, if you happened to come across this page and are wondering what the heck this is all about: We are doing the 52 Weeks of Sensory challenge. Come join us!