I hadn’t heard of this theory before now. My 5AA embryo was a girl, so whereas according to the above theories there might be slightly better odds on a 5AA being a boy, you never know! I already had a boy, and so when we did IVF for no. 2 I really really wanted a girl. If she had ended up being a boy, I would have loved him just as much and I would probably have tried again, wanting a girl. When my baby turned out to be a girl I cannot tell you how delighted i was, and every day I am grateful for my miracle baby girl. I was incredibly close to my mother, who died before I had children, and I really wanted the chance to have a similar relationship with my own daughter. There’s no guarantee that will happen, but for now oh my goodness I love having a girl. I love my boy with all my heart, he’s an amazing child, so kind and gentle, and I am immensely proud of the young teen he is becoming, but my experience is that there is something very special about having a daughter, purely because we are both girls, much as my son bonds with his father in a different way to how I have bonded with him. I can understand the desire to want to choose. If the OP really wants the choice, she can fly her embryos to the US where they are allowed to test the sex of the embryos. At the same time, I understand fully the reasons why this isn’t allowed over here. I chose not to fly to the US, but if I had had a boy, and then another boy, would I have? Most likely, yes. As it is, I’m very happy with my DS and DD, and now they’re older, rather relieved I don’t have 4 children.
When my BF was trying for DC2, she would talk about how much she wanted a girl, and how she had heard if she ate x,y and z, and did certain things, it could affect the sex…how is this any different to the OP’s current speculation? I think in her heart she knows that 5 or 6AA is no guarantee either way, but if she would really like a girl or a boy, what’s wrong with her trying? It’s not eugenics because there is no solid scientific evidence that choosing a 5AA will give her a boy, or vice versa. It’s a wish. Much as my friend wished for a girl, avoided salt and certain vegetables in accordance with what she had heard, and ended up with a boy. Who she loves with all her heart!! When the baby arrives, you love them no matter what.