Kim Kardashian and Kanye West have revealed they named their newborn son Saint West.

The 35-year-old reality star gave birth to her second child on December 5, three weeks before his due date.

Sources reportedly told E!News Kim Kardashian and Kanye West decided upon the religious name as they wanted to show how much of a “blessing” their son is after Kim’s “difficult pregnancy”.

She has made no secret that she doesn’t enjoy pregnancy and had a complicated birth due to her suffering from something called placenta accreta – when the placenta grows too deeply into the uterus.

The condition – which has the potential to cause severe blood loss after delivery – made the birth “the most painful experience ever”, TMZ reported.

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Kim Kardashian’s doctor’s needed an extra few hours to deal with the placenta issues, but the mum still managed to have a natural birth instead of a c-section, something which is believed to be recommended if suffering from the condition, according to the website.

The reality star, who described her second pregnancy as the “worst experience”, also suffered from it with daughter North and previously revealed she may have to have a hysterectomy after she gave birth to her son because of the condition.

Shortly before welcoming her son, a relieved Kim Kardashian told fans her unborn baby was no longer in the breech position.

Kim Kardashian previously revealed that doctors had attempted to turn her son around but failed and she was considering having a “painful and scary” medical procedure.

“This weekend, I checked into the hospital and underwent a procedure called an ECV (External Cephalic Version, or a Version), which is done to manually turn the baby from a breech position to a head-down position,” she wrote on her website last week.

“They gave me an IV with medication to relax my uterus, and then three doctors attempted to work together to turn the baby.”

Kim Kardashian went on to explain: “There was a risk that my water might break or the baby’s heart rate could drop – in which case, an emergency C-section would then take place. I went in with my sisters and my husband. I was prepared for it all!”

“They don’t give you any pain medication, and let me tell you: This was soooooo painful. Probably more painful than childbirth.

“BUT it worked!!! My baby is in the right position and it feels so good to not have the stress of thinking I need a C-section.”