I always went with four months; it’s a ‘period of time that takes you from your baby’s birth, to three months’.

I went with four, because that was the time their little heads peeped - bobbing and inquisitive - above the parapet that was the sling that held them close.

Just as they had transitioned from womb to world, now they were transitioning from wrap to world, unfolding gently into the bright lights of the life around them.