I think dreams are a window into our fears and feelings, our worries and our triumphs.
It's natural to be worried about what your children will be like before they're here... Try not to let a dream get to you too much, your DS will be absolutely gorgeous in a new baby kind of way!
I think, for me, it really helped my GD that new babies don't look either girl or boy - they all just look like babies! They don't come out with their sex stamped on their foreheads and I think when you have GD that almost kind of makes it easier to learn to love the little person they are - you almost forget what's between their legs until you have to change a nappy! Or at least, that was always the case for me.