Stimulation is necessary in baby squirrels whose eyes have not opened.This is because the baby has not developed the strength in the hip muscles that are used for bladder control.  To stimulate, gently tickle the genitals with a warm moist cotton ball or cloth.  Don't rub the area raw. You may get a few drops or a steady little stream.  You may not get anything at all if the baby is dehydrated.  In a properly hydrated baby, expect to get urine after almost every feeding and maybe one or two bowel movements a day.  Once the eyes are open, this is not usually necessary, but you may want to continue to keep the incubator from getting too messy or to monitor the color of the urine.  The color of the urine and color and consistency of the stool are a good way of determining the health of the baby.  The urine should be clear to almost clear. The stool should be firm formed pellets, dark yellow to dark reddish orange.   If the stool is light yellow and runny, you are probably overfeeding.  See Common problems . If the the urine is dark and tea colored, there is probably internal bleeding ( see a veterinarian ).