With size M and S, I could not do anything. Ultimately, I decided for M. When I saw the Footlet, I found him very big, is just 20.5 cm wide. So right at the Regenfüßling about the shoes (eg. Size 19 with still plenty of room) on contract. If you want to put on little feet no shoes, then it is better to resort to size S and possibly what to feed, because they have not yes, because they are drawn over the shoes.
Round and very briefly: highly recommended for toddlers that they will not miss anything. Shoes stay dry and thus child health. Will buy the shoes again, because my child goes to day care.