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How Chrissy Teigen And John Legend Know The Sex Of Their Second Baby
Chrissy Teigen, John Legend, and their daughter Luna. Elaine Thompson/AP
Chrissy Teigen and John Legend announced that they`re expecting their second child. 
They already know that it`s a boy because they used in  vitro fertilization, or IVF.
In IVF, genetic tests can determine the sex of an embryo before it`s implanted in the mother.
Teigen hinted at this news in January 2017. 
Chrissy Teigen and John Legend are expecting their second child. The couple announced the pregnancy in an Instagram video featuring their daughter, Luna, who`s 19 months old. 
Teigen also showed off her growing baby bump in a Snapchat photo. \"Very excited not to have to hide this anymore,\" she captioned it. 
A screencap from Chrissy Teigen`s Snapchat story. Chrissy Teigen/Snapchat
 
When the due date arrives, however, Teigen and Legend  won`t be surprised by the baby`s sex. In fact, they`ve known that they`re having a boy for quite some time: before Teigen became pregnant. Back in January, Teigen revealed on Twitter that the couple`s only available embryo — created using in vitro fertilization, or IVF — was male. It appears that boy was the only possible outcome.
With IVF, parents really can learn the sex of their baby ahead of time.
It`s not uncommon for parents using IVF to determine the sex of an embryo before it`s implanted, Health reports. This is possible thanks to a test called preimplantation genetic diagnosis (PGD).
First, a quick refresher on the basic steps of IVF: Several eggs are extracted from the mother`s ovaries, then manually combined with the father`s sperm in a laboratory. Next, the fertilized eggs grow into embryos.
That`s when parents can opt for PDG — a procedure that analyzes the embryos to make sure that they`re genetically normal. This can costs anywhere from a few hundred to a few thousand dollars, Health reports.
An egg cell getting fertilized by sperm in vitro. Flickr/ZEISS Microscopy
The American Pregnancy Association notes that this extra screening can benefit parents who risk passing down a genetic disorder to their kids. It`s sometimes recommended for older mothers and women who`ve had recurring miscarriages, too, according to Penn Medicine. 
Determining whether the embryo is male or female isn`t the point of PDG, but the sex of embryos is revealed as a byproduct of all that testing, Health reports. In some cases, parents might be told which of their healthy embryos are male and which are female.   
\"If more than one embryo is normal, and there happen to be both males and females, we don`t impose on patients which one they should use,\" Dr. Avner Hershlag told Health. \"If all other things are equal, it becomes their personal choice.\"
But \"picking\" the sex of your baby is considered controversial.
Chrissy Teigen and John Legend. Charley Gallay/Getty Images Entertainment
Back in 2016, while pregnant with Luna, Teigen revealed that she had specifically chosen to have a girl. 
\"Not only am I having a girl, but I picked the girl from her little embryo. I picked her and was like, `Let`s put in the girl,`\" she told People magazine. \"I think I was most excited and allured by the fact that John would be the best father to a little girl.\"
This admission stirred controversy online, the New York Times reported, since some people believe that selecting embryos based on their sex is unethical and sexist. Others take issue with the potential \"throwing away\" of embryos that aren`t the desired sex. 
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