Running her fingers over her scan for the first time, Karen Trippass could feel straight away that her unborn baby had her husband’s nose.

Born with bilateral coloboma, a rare condition also known as cat-eye syndrome, she never thought she would experience this pregnancy milestone in the same way that sighted expectant mums do, the excitement of seeing the shifting black and white shapes of a growing embryo appearing on screen for the first time.

It was something she missed out…