Was mom on the pill while pregnant (before she knew) or while nursing? Does he eat a lot of soy containing processed foods? Does he eat from plastic containers? I often wonder about the effects of estrogen when I hear these stories.
Does Mom want a girl but not a second child, so she subtly encourages feminine behavior instead of a healthier outlet?
Are the parents encouraging gender neutral behavior in the name of political correctness? And then they accidentally encouraged the female behavior?
Is he being groomed for this by man-hating lesbians and/or feminists?