Just out of curiosity - does the theory hold up with the Answerbankers that more girls are born when mums-to-be have morning sickness - and more boys when they don't. I had no sickness and had two boys. When friends have babies I'm right most of the time in my boy/girl assessments. I know it's not written in stone but wondered if it was "more likely". What do you say mums?!
We had a bit of a chat about this at our Mothers and Toddlers group recently. There are about 2 dozen mums, some of whom have had 2 or more kids. It appears that the Mums who had severe or prolonged morning sickness all had girls. There are mums who have had boys and had morning sickness, and Mums of girls who had no morning sickness, but the severity/duration theory holds water, at least with our sample group.
Sex has to do with sex. As far as I know.
That is, the amount of sex you have can change the distribution of x and y chromosones in sperm, thus altering the chances of boy or girl. And with good reason, I suppose.
I had no morning sickness and had 2 boys, as did three of my friends. My other friend had 3 girls and had bad,bad day-long sickness! I have thought this for a long time now!
I think a lot of it has to do with your hormone levels and how your body copes with the fluctuations during pregnancy. I had all day sickness till the day my daughter was born, and with me son I would have had it just as bad, but I tried some mind over matter techniques. I was nausous all the time still, though. I'm sure the differences between the way boys and girls hormones clash with their mom's is easy enough to find. But i imagine girls given off more estrogen hormones probably disrupts mom's progesterin levels and the imbalances cause the nausea. just a guess.
Some wonderful answers here. It sounds like morning sickness tends towards girls generally. But not all the time. Having never suffered it, my sympathies to all those who do. Especially those all day, whole nine months attacks.
i find it hard to believe that there's any real correlation between the two: how can one chromosome in a ball of cells, that is only directly linked to you through the placenta, affect your sickness or lack thereof?
I'm having a girl and although I felt nauseous from weeks 8-14 I was never actually sick and now I'm fine. It's supposed to be because it's the increased oestrogen that makes you feel ill, and obviously if you're having a girl there's that bit extra again in your system.
I have 2 boys and suffered very bad sickness with them both, so I do not think there is anything in the theory, I think it is pot luck if you get morning sickness or not.