Wellington Black & White Baby Carrier and Teething Necklace. Made from food-grade silicone beads that are BPA-free, phthalate-free, and free of other heavy metals, and untreated natural wood beads. Why a black and white collection? Because when the baby comes into the world, his vision is weak and blurry. He only sees strong contrasts and has difficulty distinguishing shades and objects more than 20 centimeters away from him, until he is about 2 months old. Montessori pedagogy therefore offers babies, from birth, highly contrasting supports. And the two most contrasting colors are black and white. The Wellington Black&White collection meets these expectations by offering objects in highly contrasting colors and made from different materials, to simultaneously develop baby's senses. Caring for my nursing necklace You can wash your necklace with a cloth dampened with clean water and mild soap. It is advisable to wash it regularly. This product is not a toy and must be worn by an adult.