Now that your baby has developed some motor skills, they’re ready for the Pop & Go. This is because the nipple locks in the extended position (it 's not designed to Pop when it drops) which gives you & active baby better control of the nipple. The Pop & Go also has a firmer nipple which is helpful for teething babies. Helpful for you? Being able to protect the nipple when it’s in your bag, on a pacifier clip or in your pocket. Just pinch the sides and the nipple will tuck away, no case needed.