Boy or Girl? Does the Baking Soda Gender Test Work?

​The desire and need to co-ordinate the nursery and the baby’s clothes is driving most new parents to find out the sex of their baby prior to delivery. People have tried it all, to say the very least. You’ve probably heard of many funny tales and ways of predicting whether you’re having a boy or a girl. Amongst these is the popular baking soda gender test. 

Not sure whether it works? Lets take a look at the science behind this test.

How Do You Perform the Baking Soda Gender Test?  

It is a very easy and inexpensive test that you can perform at home. Chances are, you already possess the necessary tools/supplies to perform the test. 

This is what you’ll need: (1) a clean container to collect your urine and (2) a small quantity of baking soda (see the video below).

​First, collect the urine in the container. It is important that you use a clean, dry container and collect first morning urine to avoid skewing the results. You want to make sure that your urine sample is not dilute, so it is best to collect the sample first thing when you wake up in the morning.​ If you forget to collect first morning urine, you can recreate this by not drinking water, juice, or a beverage for at least four hours before taking the test. 

Next, slowly pour about an equal amount of urine into the container containing the baking soda and watch out for the results.

This video provides a step-by-step guide on how to perform the test.

What Should You Expect?

Yay! You’re going to have a baby boy if your urine fizzes or sizzles in the baking soda. 

Yay! It’s going to be a baby girl if your urine appears not to react with the baking soda, i.e., no fizzing occurs. 

How Accurate is the Baking Soda Test?

​Lets get into a bit of chemistry here. Baking soda, or sodium bicarbonate, is an alkaline substance that can react with an acid and counter its effects. ​In general, when it reacts with an acid, it causes fizzing. In the baking soda gender test, it reacts with the acid in your urine to produce the observed sizzling. 

But how does the sex of your baby make your urine more acidic or not?

It doesn’t. In fact, the results rely on chance rather than the sensitivity and specificity of the test. Think of this as tossing a coin and expecting heads or tails. 

So what if your urine fizzes when added to baking soda? 

In reality, there are many factors that can make your urine acidic, including the type of food that you eat, the presence of a urinary tract infection, or the amount of water that you drink. 

​Foods rich in protein such as meat and fish or certain diary products can make your urine more acidic. If you drink less water or ​you’ve had severe morning sickness with a lot of vomiting, your urine may also become more acidic. Also, note that if you have gestational diabetes or diabetes mellitus and you’re pregnant, your urine may be more acidic.​

What Are Your Alternatives?

Can’t wait to know the gender of your baby? If this is the case, you might want to try more reliable methods to determine the sex of your unborn baby.

1. Ultrasound

An ultrasound machine uses high-frequency waves to produce images of the fetus. While it is one of the most likely methods to give you reliable information, you will have to wait until the 16th to 18th week of pregnancy since scans performed between 18 and 26 weeks of gestation are the most accurate at predicting a baby’s sex.

However, there might be instances when the fetus is positioned such that the technician cannot “see” its genital organ. A future scan might be necessary to tell whether you’re having a boy or a girl.

No special procedure is required to perform an anatomy ultrasound as you can see from the video below that shows an ultrasound examination performed live on ‘The Doctors.’

2. At-Home Gender Prediction DNA Test​

Couples who can’t wait until the 18th week of pregnancy can opt to have a DNA test, which can be performed as early as nine weeks into the pregnancy. SneakPeek-Early Gender Prediction DNA​ test, for example, can be used to determine the sex of a fetus, and the manufacturer claims a 99% accuracy rate to determine whether the fetus is male. The test works by detecting the presence of the male Y chromosome in a blood sample that you can obtain via a finger stick. Results can be obtained five to seven days after you place your order. ​

3. Amniocentesis and Chorionic Villus Sampling ​

​These are the most accurate methods of determining the sex of a fetus. However, because they are invasive and pose potentially fatal risks to both mother and baby, they are not performed unless there is a strong medical reason to do so. Amniocentesis is performed after the 14th week of gestation (usually between the 15th and 20th week​)​, whereas chorionic villus sampling is typically performed between the 10th and 13th week​ of pregnancy. 


Currently, there is no scientific evidence to support the accuracy of the baking soda gender test. I wouldn’t recommend this test unless you just wish to have fun playing scientist. One thing though is to remember that before splashing out on pink or blue accents for your baby’s nursery, it might be smart to perform a DNA test or an ultrasound scan first.​

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I’m Princila, founder of Check Ovulation and a proud mom of two. I’m an alumna of James Lind Institute. After working in clinical jobs, my passion for writing took its toll, and I ended up switching careers to work in the medical publishing industry. I also have a passion for healthy food, which prompted me to take several online courses in nutrition and health offered by Wageningen University. (I still haven’t completed the courses thanks to my busy mommy schedule!). When I’m not writing/editing scientific and medical manuscripts or taking care of my family, I use my free time to research, learn, and write about healthy living. I have also authored a few books in the self-help niche using the pen names Princila Murrell or PN Murray. Protection Status