United Kingdom, March 20 -- Jesy Nelson's twin daughters have been fitted with leg splints to "flatten out" their feet.

The former Little Mix singer revealed in January that her and former fiance Zion Foster's nine-month-old twins Story and Ocean had been diagnosed with SMA1 (Spinal Muscular Atrophy) - the most severe form of the progressive muscle-wasting disease - and she was left "sad" this week when she received another reminder of their devastating health struggles.

She said in a video shared to her Instagram Story: So today, I had to go pick up the girls' splints because their feet are pointing, and they need to be flattened out. It made me really sad."

The 34-year-old star then showed off the tiny and "cute" patterned moulds for...