BIBS' award-winning Grow and Flow BPA-free bottles have been meticulously designed to promote healthy, easy feedings. Mimicking the natural breast shape and feel, the food-grade silicone nipple promotes a natural latch and eases transitions between breast and bottle. An anti-colic valve reduces air intake to help prevent gas, reflux and colic. And if the bottle tips over, a built-in lock prevents spilled milk. When feeding time is over, the lightweight bottle can go straight in the dishwasher.