When you've just found out that you're pregnant with twins the world goes silent for a few moments. It's like an explosion has just gone off in your brain as you deal with this new information. All you can see is the two blobs on the ultrasound screen. Your tongue won't move in your mouth and you can't hear what the sonographer is saying because that last word they uttered has literally blown your mind...
There are four primary reasons for multiple births. "It runs in the family" (inherited on the mother's side) and a higher propensity within some ethnic groups; Nigeria has the highest multiple births rates in the world, for example, with Japan among the lowest. However, neither of these are increasing the overall number of multiple births.
From conception onwards, having twins seems to raise the bar. Through pregnancy and birth, mothers having twins are viewed as twice as delicate, with their precious double burden, placing a pressure on babies and parents that impacts on the birth as well as the early days and weeks of the babies' lives.
It's a little like being asked what it's like having a pair of lungs. I don't know - Good? Useful? Essential? Being a twin makes up my DNA: my twin-ness sits snugly inside each and every cell that makes up my body. It's why we have the same colour eyes; the same colour hair and tiny wrists. It's why I am me and she is, well, she.