Melanie
                    
                    
                    
                    
                    
                    
                    
                        
                        
                        Yeah if she undergoes radioactive iodine treatment it does cross the placenta no matter what the Dr's say and if they give her ptu medication Beta Blocker.  It causes a cleff lip.  She is high risk and may not carry the pregnancy full term.  I didn't I lost the baby on the 90th day.  Good luck hope she is doing fine.