Extralarge openings in the shield provide maximum airflow and allow babys sensitive skin to breathe Orthodontic nipple shape is asymmetrical with a scooped bottom Flatter to allow for more room for natural sucking motion slimmer to reduce pressure on jaw and teeth and narrower to help prevent teeth misalignment Heartshaped shield fits perfectly under babys nose for easy breathing Pack of 2 NUK Space orthodontic pacifiers Size 618 months BPA free silicone nipples toprack dishwasher safe