Dr. Brown's anti-colic baby bottles feature a unique design to reduce colic and gas. The bottles are perfect for your little one's feeding needs. • Gently used, no nipples included. Only 3/4 clear caps. 4 white plastic twist tops included. • BPA-free, dishwasher safe (top rack) • Anti-colic vent system helps reduce spit-up, gas & colic • Consistent flow rate, closest to breastfeeding • Preserves nutrients & aids digestion for better sleep • Vent system removable as baby grows • Recyclable & eco-friendly design