I found the product too small and tight to go up 18 months! my baby 4 months (7K400) is tight like sardines in a box! was no longer able to breathe, her thighs are compressed! Indeed, the hole is too small, certainly bb buttocks are attached and there is enough tissue, but I find that it is really lousy, also in the arms in the closed position longer ruling affects bb and skin hurts, this product should have a baby of one month up to its three months no more, and what about the back pain that I have felt, therefore, that I have it wear! barely 2 minutes with my shoulders and back and suffered martyrdom, even without wearing baby product I have less pain, I am very very disappointed!