Parents have long counted on BIBS award-winning glass bottles for happy, fuss-free feedings. This set includes a 4-ounce bottle with a slow flow for young babies, and an 8-ounce bottle with a medium flow to keep up as their feeding pace changes. Each one is fitted with a latex nipple and an anti-colic valve to reduce gas and reflux. A milk lock prevents spills, and a collapsible funnel makes it easier to mix formula. The durable, scratch-resistant glass bottles are dishwasher safe.