Dr. Brown’s Natural Flow Options+ Level 4 Wide-Neck Teat is a fast flow teat, designed for babies who are more developed or prefer a quick flow. The breast-like shape encourages proper latch for natural feeding experience. Correctly contoured teat shape and soft silicone give comfortable feeding experience and help avoid nipple confusion. Perfect for switching from breast to bottle and back again. The suggested age range for the Level 4 is 9 months+ but baby’s preferred flow rate may vary. Fits Dr. Brown’s Options+ Wide-Neck bottles. Dishwasher (top rack) and sterilizer safe and BPA free. * Not compatible with the Dr. Brown's Options Wide Neck Bottles.