I have identical twin girls aged 10 weeks and I thought I could tell the difference between them and would always be able to coz a mummy really should know her kiddies . Up until now it was fairly easy because one is 1.5lbs heavier then the other BUT I just spent 20mins cuddling and cooing over gorgeous daughter X only to realise that she is actually Y when I put her back in her bouncy chair beside her sister. Please tell me that you get your identical twins confused also otherwise I'll feel like a terrible mummy