My dh and I have a 5 year old daughter, conceived naturally and miraculously after a failed IVF attempt, because of very low sperm count. We are both, though me in particular, longing for another child and have left it pretty late in the hope that miracles might strike twice, which they haven't. I'm now 42 so don't even know how successful it would be. We're also worried about what it would be like having one who is genetically both of ours and one who isn't. Anyone have any experience of this? This is my first post on MN.