Three Hearts pacifiers are also a teether in one. We have designed our pacifier with all BPA free silicone that allows mommy and daddy to clean easily in the dishwasher and also allows parents to freeze like any of our teethers. They are a universal size and suggest for new born until 18 months. We have been transitioning to new redesigned handle. Your shipment may come in a mix of old and new handles depending on colors until our older handle stock is out. Most flat shape will be in older handle unless a newer color. Please contact us for further clarification. All aspects of pacifier has remained same.