The Children's Placegirls Unicorn Long Sleeve Graphic T-shirts,multipacks Unicorn Long Sleeve Graphic T-shirts,multipacks (pack of 2)

Size translation please? Small = ??

Do these shrink a lot in the wash?

Does anyone know if I can buy these individually? My daughter loves the navy cat shirt in the set with the skates but does not care for the other two.

Will this shrink or is it pre-shrunk?