NUK First Choice Anti-Colic Wide Neck Silicone Teat x 2 0-6 months. Clinically tested Supports breastfeeding BPA free NUK anti-colic air system The orthodontic NUK shape, combined with the NUK shape, combined with the NUK First Choice extra wide lip support, makes it easier to breastfeed and to alternate between breast and bottle. The NUK Anti-Colic Air System minimises the risk of infant colic caused by harmful swallowing of air. NUK teats soothers are accredited by the British Dental Health Foundation.