When my son was little I was very passionate about breastfeeding. In fact I breastfed until he was two and half years old.
He is now 6 years old and goes to school. He doesn't appear any different to his classmates. There is no way of telling which children were breastfed or bottlefed.
The only thing that my son is gifted and talented at is getting invited to girls parties! He enjoys school and has plenty of friends, but he certainly isn't an academic genius.
As he has got older I have realised that there are more important parenting issues that affects how a child turns out. For example there is no excuse for not teaching a child basic manners or not supporting a child's school.