FILE PHOTO – Kim Kardashian and Kanye West arrive at the 2016 MTV Video Music Awards in New York, U.S., August 28, 2016. REUTERS/Eduardo Munoz/File Photo

Last month, reality TV personality Kim Kardashian West and her husband Kanye West announced the birth of their third child. The couple’s daughter Chicago was carried via a gestational surrogate. She was created from a fertilized egg taken from Kardashian West, and had no genetic tie to the surrogate.

How common is gestational surrogacy?

It’s not that common, but it’s difficult to nail down exact numbers. The Society for Assisted Reproductive Technology (SART) reported 1.5K+ babies born from gestational surrogates in 2011, up from 1.3K+ babies born via the method in 2009. Another source reports 1.4K+ babies born via gestational surrogacy.

It’s difficult to pin down an actual number, because some cases of gestational surrogacy may not reported. It’s also difficult to tell when the sample size is so small.

As the procedure becomes more widely available, we’ll be able to see how common gestational surrogacy really is.