I can not recommend this version of the suckers, at least not if you want to use it also for the little babies with the I. Once you do not keep the bottle correctly 100 percent, the milk flows out too fast. The correct position is, however, especially at night as well as not to be recognized. For the price you would have the numbers at least can make color, so that they can also recognize. As variable suction is therefore totally failed for me. I'm going to him until later when my child is old enough for the III, because if he has to make an effort now and then more, because the bottle was not exactly maintained, that does not matter.
Until then, I'll buy the respective size rather individually. This is much safer for my child. Since I have even after the number looking for, but at least he is not drowned in milk.
I find that in the otherwise good quality very poorly thought out and am as I am otherwise convinced of the Naturnah suckers quite disappointed accordingly.