He paid zakaat al-fitr on behalf of the foetus then found out that it was twins
Question

                My wife was pregnant during Ramadaan and I paid zakaat al-fitr on behalf of the foetus that was in his mother’s womb, but when the mother gave birth a few days after Eid al-Fitr, she gave birth to two twins by the will and decree of Allaah. 

Do I have to do anything now, knowing that I gave zakaah on behalf of one foetus and I did not give anything on behalf of the other?.
Praise be to Allah.You do not have to do anything because of not 
    paying zakaat al-fitr on behalf of the second foetus. 
And Allaah is the Source of strength.