United Kingdom, Feb. 12 -- Jesy Nelson no longer has "time" to make music.

The former Little Mix singer is taking a break from her career to focus on her eight-month-old twins Ocean and Story and to campaign for testing at birth for

SMA1 (Spinal Muscular Atrophy Type 1), a severe form of the rare, progressive, non-reversible, muscle-weakening genetic condition which both of her daughters have.

Speaking to Amanda Holden and Jamie Theakston on Heart FM's Breakfast show, Jesy - who recently split from her daughters' father, Zion Foster - said: "Look listen I'd never say never say never to music, but for me, my girls are my main focus, I'll be honest with you, I've not got time, I really don't.

"They are my whole heart and soul and my mai...