When my sister was pregnant with my niece, I remember her telling me she had a horrible pregnancy. With health issues being prevalent, swollen feet being a regular, and morning sickness being present at all times of the day, there was a time where her doctors thought they were going to have to deliver her child early. When she was delivered the news, she immediately began researching others who have had premature births, and found out that there were many of her favorite celebrities who delivered preterm too.

After reading stories about celebrity pregnancies and the issues that brought them to have their children early, she came across an article in Parents that stated that the leading cause of death among newborns is due to premature birth. With indicators such as severe stress and blood pressure issues, we began to worry that she may have issues similar to the celebrities we were researching.

As her pregnancy got a little further along and her health issues decreased, the probability of her delivering early was decreased right along with it. Though my niece was born in time, the scare of having to deliver a possible unhealthy baby weeks or months early was something that brought the awareness of premature births to our entire family.

My sister, who now has a healthy and lively 2-year-old may not have experienced a premature birth, but these 13 celebrities did.

1. Kim Kardashian West

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CAP D'ANTIBES, FRANCE - MAY 17: Kim Kardashian attends the De Grisogono Party at the annual 69th Cannes Film Festival at Hotel du Cap-Eden-Roc on May 17, 2016 in Cap d'Antibes, France. (Photo by Andreas Rentz/Getty Images)

According to Parents magazine, Kim Kardashian West gave birth to North five weeks earlier than expected.

2. Bethenny Frankel

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People wrote that Bethenny Frankel told her then husband, Jason Hoppy, that her water broke five weeks prior to baby Bryn's due date.

3. Faith Hill

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HOUSTON, TX - NOVEMBER 6: Singer Faith Hill attends the UNICEF Audrey Hepburn Society Ball honoring former first lady Barbara Bush at the Hilton Americas Hotel on November 6, 2015 in Houston, Texas. (Photo by Bob Levey/Getty Images for U.S. Fund for UNICEF)

Because her amniotic fluid was almost gone, Faith Hill gave birth to daughter Aubrey was eight weeks before schedule, according to Madame Noire.

4. Nancy Grace

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BEVERLY HILLS, CA - DECEMBER 07: TV Personality Nancy Grace arrives at The Hollywood Reporter's Annual 'Power 100: Women In Entertainment Breakfast' at The Beverly Hills Hotel on December 7, 2011 in Beverly Hills, California. (Photo by Kevin Winter/Getty Images)

Giving birth via emergency C-section, television journalist Nancy Grace delivered her twins almost two months early, Good Housekeeping reported.

5. Julia Roberts

US actress Julia Roberts poses on May 12, 2016 as she arrives for the screening of the film 'Money Monster' at the 69th Cannes Film Festival in Cannes, southern France. / AFP / LOIC VENANCE (Photo credit should read LOIC VENANCE/AFP/Getty Images)

Born just over five pounds each, Huffington Post wrote that Julia Roberts' twins, Phinnaeus and Hazel, was delivered via C-section at 36 weeks.

6. Sherri Shepherd

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NEW YORK, NY - MAY 16: Comedian Sherri Shepherd attends the NBCUniversal 2016 Upfront Presentation on May 16, 2016 in New York, New York. (Photo by Slaven Vlasic/Getty Images)

According to People, television star Sherri Shepherd gave birth to her son Jeffrey at only five-and-a-half months.

7. Celine Dion

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PARIS, FRANCE - JULY 04: Celine Dion attends the Christian Dior Haute Couture Fall/Winter 2016-2017 show as part of Paris Fashion Week at 30, Avenue Montaigne on July 4, 2016 in Paris, France. (Photo by Pascal Le Segretain/Getty Images for Dior)

Madame Noire wrote that superstar vocalist Celine Dion gave birth prematurely in 2010 to her twin boys Nelson and Eddy.

8. Anna Faris

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LOS ANGELES, CA - JANUARY 30: Actress Anna Faris attends the 22nd Annual Screen Actors Guild Awards at The Shrine Auditorium on January 30, 2016 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

Actress Anna Faris successfully delivered her son, Jack, in 2012 despite being nine weeks early, according to Huffington Post.

9. Kate Gosselin

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PASADENA, CA - JANUARY 16: TV personality Kate Gosselin onstage during the 'The Celebrity Apprentice' panel discussion at the NBC/Universal portion of the 2015 Winter TCA Tour at the Langham Hotel on January 16, 2015 in Pasadena, California. (Photo by Frederick M. Brown/Getty Images)

Reality TV star Kate Gosselin has had premature births with all of her children, according to Huffington Post, with her twins being five weeks early and her sextuplets being 10.

10. Angelina Jolie

US actress Angelina Jolie poses on the red carpet before the screening of 'The Tree of Life' presented in competition at the 64th Cannes Film Festival on May 16, 2011 in Cannes. AFP PHOTO / VALERY HACHE / AFP / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

USA Today noted that Angelina Jolie and Brad Pitt were blessed with their twins, Knox and Vivienne, earlier than expected so that the babies could be born "in the best conditions."

11. Brooke Mueller

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BEVERLY HILLS, CA - NOVEMBER 21: Brooke Mueller arrives at the 12th Annual Lupus LA Hollywood Bag Ladies Luncheon at The Beverly Hilton Hotel on November 21, 2014 in Beverly Hills, California. (Photo by Valerie Macon/Getty Images)

Actress Brooke Mueller and ex Charlie Sheen, welcomed their twin sons Max and Bob, seven weeks early after Mueller suffered from preeclampsia, Madame Noire wrote.

12. Blake Lively

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NEW YORK, NY - JUNE 21: Actress Blake Lively attends the 'The Shallows' world premiere at AMC Loews Lincoln Square on June 21, 2016 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

Us Weekly confirmed that Blake Lively and husband Ryan Reynolds welcomed their first child together right before the 2015 New Year though birth wasn't scheduled until February.

13. Jamie Anne Allman

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HOLLYWOOD, CA - JULY 14: Actress Jamie Anne Allman attends premiere of Netflix's 'The Killing' season 4 at ArcLight Cinemas on July 14, 2014 in Hollywood, California. (Photo by Jason Merritt/Getty Images)

Born 81-days before her due date, actress Jamie Anne Allman's twin boys both weighed under four pounds, Us Weekly wrote.