If you desire a smaller print feel free to message me. This is set at the original size. A smaller version is this design set at 393dpi; http://www.spoonflower.com/fabric/944243. An even smaller might be better for children's clothing. For my first swatch I actually printed this at 675 pixels/inch with the horses at 1 inch long, it printed great. Though probably 450 would be best for clothing.
Wallpaper Coverage Calculator
Based on the dimensions you provide, this calculator will determine the number of custom-length sections of paper you'll need to cover any surface. If the height of your surface varies, input the tallest dimension in order for the pattern to line up correctly.
Enter your dimensions in feet (1 foot is 30.48 cm).