I basically played Mozart and violin concertos again and again because it stimulated the inner ear of the unborn baby, and everything that they promised happened to both my children. They came out alert, unbelievably clever, and very relaxed.
—Helena Bonham Carter
Of course if they take up oboe they’ll probably lose the “very relaxed” bit. ;-)
I read it here.
Oh, and I think most mothers believe their children to be unbelievably clever. Except when they are misbehaving, that is!