It is hard to use this product when the baby not eating 4 or 8 oz at a time since this is how they are pre-measured. But I think it is still a great product and very good for travel, daycare or at home. Enfamil is also great formula compared to other brands.Note: You can easily split one package in half to make a 6 oz bottle. You can pinch the tube with your fingers and only pour half the package into the bottle.Ordered with two day shipping and arrived as scheduled!!