When baby is ready to learn straw sipping skills, take baby steps with the Dr. Brown's Milestones Sippy Straw Bottle. The soft silicone straw is weighted so baby can tilt and sip while learning upright straw skills. Both the sippy straw cap and silicone handles fit all Dr. Brown's Options+ 8oz/250mL baby bottles and sippy spout bottles, meaning you can teach baby many new sipping skills with the same bottle!