I am thinking every time they eat to every other time. How long has it been since you have gotten them to go? If you don't have some poop by morning then I would take them to the vet if for nothing else to make sure you are stimulating them correctly. The vet can show you as it could be something as simple as maybe you aren't getting the right spots or using the right pressure. They shouldn't start going on thier own until about 21 days or so.
Kim
