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1OK so according to our scriptures the story is this. The seventh son of Vasudev and Devki was supposed to be Sheshji. Some say that he Sheshji is Sheshnaag, he was Laxman in the Rama avatar. I am not sure about this, some one please confirm.
Anyhoo, so in the 7th month of Devki's pregnancy, Lord Vishnu asked Mahamaya to transfer the baby from Devki's womb to Rohini's (who is Vasudev's first wife) womb. Thus although Balramji was Devki's son he was born from Rohini's womb.
I hope that clarifies things for you.