claire
                    
                    
                    
                    
                    
                    
                    
                        
                        
                        turner's syndrome is very rare and it is my understanding that it happens at the time of inseption.  I had two very healthy children and my third child was born with turner's syndrome.  She is now 30 years old and the mother of twins.  Feel free to email me.  I do not have all the answers but have lived your fear.