by SillyLilPuppet » Fri Jul 26, 2013 4:44 pm
Sd and Sd13 are usually used interchangeably unless you are actually looking at the Volks website. Officially the difference is that SD dolls look a little younger and are about 2 cm shorter than SD13, who have a slightly more mature teen body. Most places call SD dolls SD10 too.
Not too familiar with Little Monica dolls but if you can find the body's measurements on their website, you can compare it to Volks measurements and have a better idea of what will fit your doll.