Review on Original McSir Mixing Pitcher Blue by Travis Caminiti

I bought this to make baby formula hoping to make around 40-48 each time oz to get. The plunger/blades fell apart on every try. The blade fell off even if there was liquid without powder in the container. If the plunger blade falls off, you have to put your hand in the container to remove it. It were small black things in the plastic along the top edge, see photo.