Most doctors order routine urine tests when children get to be around five years of age. Although it is easy to collect urine specimens from boys, girls often have difficulty placing the cup between their legs. You can make this task easier for your daughter by having her sit on the toilet backwards. When a girl sits in this position, the toilet seat not only pushes her knees apart, but there is also more room between the back of the seat and the child’s bottom to “catch” the specimen.