The smaller one works as a potty chair, just so toddlers can sit on it. The 2nd is just a deco item.
The mouse toy is by Prince Lionheart, in appreciation for my creations Prince Lionheart sent me a real-life version for my grandkids. See pic of Aubree on it.
These are both in the Sims3pack form and created with TSR Workshop.
To install just double click on the file you download.