The Learner Bottle is part of the NUK First Choice range which means the parts are all interchangeable with any other First Choice products. The First Choice range was developed with mums and medical experts worldwide to find the ideal feeding bottle. First Choice bottles have an extra wide neck to make it even easier to make up a feed and clean the bottle afterwards, and easy to hold. The sealing disc and screw ring guarantee leak-proof transport. They are available in plastic (BPA Free polypropylene) or glass