Crafted with your child's orthodontic development in mind, the Nuk Signature soother is meticulously designed to accommodate the shape of your baby's mouth, facilitating the exercise of their lips, tongue, and facial muscles. Engineered to promote natural sucking, its flat, thin, and narrow design ensures a snug fit in small mouths, while also allowing ample space for tongue movement. Plus, it's BPA-free, providing peace of mind for parents concerned about their baby's safety and well-being.