I have very nearly decided on the Mountain Buggy Duet for my twins, due in about six weeks. It says the buggy is suitable from birth and has a "lay flat" mode. Carry cots are available to fit it, but the costs are really adding up with there being two of everything to buy and I know they wouldn't last long. We've already been given moses baskets for them to sleep in at home. So, if the buggy can "lay flat", does that mean the carry cots would be an optional extra or are they a necessity? I have also read about cocoons and liners which appear to be possible alternatives to keep them more secure and comfortable. I am a first time mum and feel very overwhelmed - been reading up on these things for most of the day and still confused 