+-1 Nursing Bottles / nursing bottles

Generally, the parents will buy small nursing bottles for their babies when they are just born, and will change bigger ones as they grow. Then, the small nursing bottles they once used will be unused thus cause waste of resource.

This design disassembles the nursing bottle into two parts. As the baby grows, it is able to assemble the other part to enlarge the bottle. If you give birth to another baby, as long as you take off the second part, the nursing bottle can restore as a small one. This design enables repeated use and avoids waste of resources.