In recent years I have slightly misled my children. Avoiding the whole conversation about where babies come from and how they actually trundle down the birth canal has always been a focus of mine and he who helped create them.
When BB was born, twin girl was full of awkward questions but was easily fulfilled by a quick glimpse of the bandage on my stomach and was happily comforted in the knowledge that babies were simply lifted from your tummy and then a doctor glued you together again.