Despite being 51 years old, a successful career woman in New York City gave birth to a healthy baby girl last month.

With the help of science, a single Manhattan mom and prominent publicist named Tracey Kahn safely delivered her second child, Eloise Becket Kahnon, on Feb. 18.

"I'm the happiest I've ever been," Kahn told People. "I get responses like, 'OMG you're so old, why would you do that?' I tell them that I'm in good health and just decided to fulfill my dream of having kids, whether I was married or not. It's all about how you raise them." 

Kahn first shared her story about getting pregnant at 51 with The New York Post in September 2014. Like her first child, whom she gave birth to at the age of 49, her new baby is the product of the same anonymous donor egg and sperm, which make her daughters full biological sisters.

Although both babies were conceived via in vitro fertilization, Eloise was conceived at Reproductive Medicine Associates of New York. Meanwhile, her older daughter, Scarlett, was conceived at the Weill Cornell Medical Center. Weill Cornell would not allow her to conceive again at the clinic since she was over 50.

Nonetheless, Kahn said she is overjoyed with the birth of her second child, who weighed 7 pounds and 6 ounces at birth. She was delivered via C-section at the New York-Presbyterian Hospital.

"I'm beyond thrilled, the happiest I've been in my life," the Upper East Side businesswoman said. "I have this great, perfect family!

"I'm feeling super healthy, and the baby is beautiful."

The breast-feeding mom has hired a baby nurse for $350 a day.

"I've worked very hard my whole life to afford this situation, so why not?" said Kahn, who is employed by a high-profile jeweler.

"There are so many positive things to having a baby this late in life. Yes, I'm older, but I'm in great shape. I have a great head on my shoulders, with a great system of friends."

However, she admitted she has "bad days where I wake up and realize I'm going to be 80 when she's 29, but I try not to worry too much about it."