Marnie Simpson has shared the adorable moment her 12 week old son Rox laughed for the very first time.Taking to her Instagram Stories, the 28 year old shared a series of videos showing her little one in a dinosaur-patterned blue and white sleepsuit. Sitting in a baby rocker, Rox could be seen smiling as his mum said: "You just laughed before! Come on," before repeatedly saying "Cheeky boy!" to entice a giggle out of him.