A source close to Kardashian tells ET that the couple had always planned on hiring a surrogate for their third baby "after the complications with the other pregnancies."
"They took their time finding the right woman to carry their baby, and of course they are being very hands-on during this process," the source added.
According to a source close to the family, the expectant parents are paying their surrogate 10 monthly installments of $4,500 for a grand total of $45,000. The surrogate will get $5,000 for each additional baby, if she has multiples, and if the surrogate loses reproductive organs, she gets $4,000.
The couple was also required to deposit $68,850 with the agency they used to find their surrogate.
"They are going to make sure she has her privacy and whatever she needs," the source says, adding that the couple also aren't going to impose any unreasonable rules on the surrogate. "Kim and Kanye wouldn’t make any wild demands -- they just want a healthy pregnancy."