Hearing the gentle beating of your child’s heart is precious for every mum. But when Amy Anderson listens to her daughter Mia Hicks’ heart beating in another little girl’s chest it feels simply incredible. Smiling, thoughtfully, Amy, 35, says: “It was just so special.” Seeing Amy with Becci Westwood, 41, and her charming daughter Grace, five, together on a chilly winter’s day, they look like a happy extended family, enjoying a stroll together in the park. In fact, the story behind this little