Your egg® stroller can be converted into a tandem with the use of the tandem S shaped adaptors. The adaptors are easily fitted which allow you to use your stroller for your newborn and toddler. Your already purchased full size Carrycot and Seat Unit attach to the adaptors. An additional full size tandem seat unit, suitable from 6 months, can also be added when your Baby has outgrown the carrycot. If you are expecting twins the egg® can be purchased as a twin option. Purchase the stroller, the tandem adaptors, a second seat unit and two carrycots to build a perfect twin tandem stroller. Car seat adaptors are available to add Group0+ car seats in both the upper and lower positions