The programme began in England on October 1 and adds SMA to the existing newborn blood spot test, formerly known as the heel prick test.

SMA is a rare but serious genetic condition that causes muscle weakness and can affect movement, swallowing, and breathing.

Newborn babies in Norfolk will soon be tested for a rare genetic disorder affecting former Little Mix star's twins. (Image: PA)

The heel prick test already screens for 10 rare conditions.

Dr Harrison Carter,........

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