lauren perry , 25 , gave birth to her twins 10 weeks early at just 30 weeks .
mason and chloe were in intensive care for two months after their birth .
ms perry 's son had a colostomy bag put in when he was just one day old .
when mason later underwent surgery to have it taken out he got sick .
newborn had contracted a flesh-eating virus which almost claimed his life .
parents would have lost him if he had been left untreated for another hour .