The Lifefactory 6-Glass Mint/Blanket/Blueberry/Kale Baby Bottle Starter Set makes for a beautiful gift for new and expectant moms. They're ideal for baby showers and they're easy to wrap. It's a great way to ensure baby gets off to a healthy start. These baby bottles are made of the highest quality, thermal shock-resistant borosilicate glass. This allows these bottles to transition safely from freezer to boiling water. The 6-Bottle Starter Set includes: four 4 oz. glass baby bottles, two 9 oz. glass baby bottles, 2-flat caps, 2-sippy caps, and 2-silicone nipples. The 4 oz. bottles come with Stage 1-nipples, and the 9 oz. bottles come with Stage 2-nipples.