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Baby Comp Gender Prediction: Does it Work?

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A few years ago, when I started looking into alternative methods to hormonal birth control, I was introduced to the Baby comp machine

This little gadget helps with the Fertility Awareness Method, acting as an alarm clock, thermometer, and cycle monitor all at the same time. You simply take your basal body temperature every morning (before getting out of bed), and then the machine gives you a green, yellow or red light each morning to let you know how fertile you are for the next 24 hours.

What makes the Baby Comp especially unique is its Gender Prediction feature. During the few days it expects you to be fertile, it also displays a “girl” or “boy” light (or both) to let you know which gender you are more likely to conceive over the next 24 hours.

The longer you use the Baby Comp, the better the machine gets to know you, and the more accurate it becomes with its predictions. Keep in mind, however, that is all it can provide– predictions. As I understand it, the Baby Comp makes its predictions based on the previous months of information it has collected (along with pre-compiled data that is loaded onto each machine when it arrives), so if your cycle tends to fluctuate, it may not be 100% accurate.

But, we couldn’t help but wonder if it would work.

So, my husband and I decided to try for a girl this time around. Ultimately, we were just hoping that the Baby Comp would increase our chances of getting pregnant at all, but we decided to “try” for a girl because the odds are just slightly more in favor of having a boy, in general. (For 63 years in a row, more boys than girls were born in the U.S.) We were careful to only try on “girl” days, and got pregnant on our second cycle of trying.

So, I definitely think the Baby Comp helped us conceive quickly!

Did the gender prediction work?

gender reveal

Nope. We ended up having a little boy… whom we love to bits!

It’s possible that the Gender Prediction feature would work better for someone with a more consistent cycle. Before trying to conceive, mine varied in length, which would definitely have an impact on the prediction. Perhaps we ended up actually trying on a “boy” day, even though the Baby Comp predicted it would be a “girl” day.

Or, perhaps there’s no way to actually change your odds.

baby boy

Either way, the end result is pretty awesome– boy or girl!

Reader Feedback: Have you tried using any Gender Prediction methods? I’d love to hear about your experiences!

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Thanks for this review!


This looks like an amazing tool for tracking fertility. However, as a nurse, it doesn’t seem possible for it to predict the chances of having a boy or girl. Gender is totally dependent on the man’s contribution. Women have “XX” for their sex genes, so they will always give their baby one “X” gene. This differs in men. Because they have “XY” they will put forth either an “X” or a “Y” when it comes to conception.


I found your blog helpful as I couldn’t find much information online about this Babycomp feature. We didn’t specifically try for one gender or the other with our Babycomp but at the end of the cycle I got pregnant it predicted girl – just had my ultrasound and it was right!

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