Went to use mine & double checked the amount that comes out against amount held in Similac measuring spoon. Was over by 1/2 scoop of formula when using 2 pumps. You know that's bad b/c too much causes constipation too little causes not enough nutrition. Called company & they said it's off the markt until winter of 2013, yes almost a year from now. So if you have it, likely it's defective. They can tell by your model on the bottom.