A mum has told how her tiny four-year-old daughter, who is just two feet tall and weighs only two stone, has left doctors baffled.? Born smaller than a doll, Sophia Hecimovic measures just 87cm – compared to the 102cm average height for girls her age, who weigh nearly a stone more.? Oddly, tests have shown the adorable child does produce growth hormones, so medics cannot figure out why she is so tiny.? Her mum Effie Panayiotou, 29, said, “It’s so frustrating, because we don’t have an answer as to why she’s so much smaller than other children her age. Developmentally she’s behind as well – it took her two-and-a-half years to walk. People are very surprised when they see her and find out her age because she’s so small.” Doctors first spotted Sophia was growing abnormally after Effie’s 19-week scan.? The nursing student was advised to have a caesarean at 36 weeks at Sydney Southwest Private Hospital, where medical staff kept a close eye on her delivery.? Sophia arrived into the world weighing just 4lb and 13oz and measuring 46cm – below average for a newborn.? And when she was placed beside a doll her mum had bought for her, Sophia was shorter.?For three weeks, the little mite was kept in hospital and closely monitored. Appearing weak, blood tests for chromosomal defects – came back negative. Despite her diet of high-calorie formula, she failed to gain weight and missed the usual milestones.? These included failing to sit up until she was nine months old, compared to the usual four to six months. “I was very worried because she had the strength to turn pages, but didn’t have the strength to sit up,” Effie said.? “At eight months, she weighed just 11lbs and had grown to 61cm. In addition to her stagnated mobility, Sophia lost the ability to speak after her first birthday, despite saying ‘mumma’ and ‘dog’ at five months.” Aged one, she was diagnosed with Robinow Syndrome, a rare genetic disorder that affects the development of the bones. Only 250 families worldwide are affected by Robinow Syndrome. But Effie was relieved to finally have an answer for her daughter’s short stature, especially as her condition was not deemed to be life-limiting. With the help of fortnightly physical therapy sessions, her mobility started improving. And by 17 months, she could crawl.