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Can my child sit on these blocks?

Yes! And grown-ups can also sit and even stand on these blocks. Just make sure you even out the weight by covering the blocks with a flat surface. Certified average weight hold is 59 lb. / 27kg for an XXL block and 53 lb. / 24kg for the XL version.

Size of XL and XXL

The only difference is in size.
XL is 60% from XXL block size. 

XXL are 7.87x3.94x3.94in (20x10x10cm). 

XL are 5.11x2.56x2.56in (13x6.5x6.5cm).