When baby is ready to learn straw sipping skills, take baby steps with the Dr. Brown?s Milestones? Sippy Straw Bottle! Baby can keep the bottle they love while learning new sipping skills. The soft silicone straw is weighted to tilt and sip while learning upright straw skills. Sturdy yet soft Silicone Handles make gripping easy and help to teach baby new motor skills. A sliding cap keeps messes contained when closed and offers spill-proof travel. Both the sippy straw cap and Silicone Handles fit all Dr. Brown?s? Options+? 9 oz/270 ml baby bottles and sippy spout bottles. This means you can teach baby many new sipping skills with the same bottle! Dishwasher (top rack) and sterilizer safe. BPA free. 6m+.