Amy and Alex’s full story airs tonight on The Feed on SBS 2.

WHEN Amy Day found out she was born without a uterus she didn’t think much of it at the time.

As a teenager, kids were the last thing on her mind.

But when she met husband Anatole in her late 20s, she realised the enormity of her situation and that motherhood may never happen.

“I remember when I found out I didn’t have a uterus, I was only 15 or 16 and just thought at least I’d never have a period,” she told news.com.au.

“But when I met and fell in love with Anatole, and knew he wanted kids and saw my friends and family having kids, it all changed.”

Amy, 33, was born with working ovaries and fallopian tubes but no uterus, meaning her only chance at becoming a mother was through a surrogate.

Fortunately for Amy, her younger sister Alexandra Miller, 31, offered to carry a baby for her.

Commercial surrogacy is illegal in Australia and altruistic surrogacy is allowed but is incredibly rare.

This means some couples travel to countries such as Thailand and India every year, where surrogacy is unregulated and women are paid to carry babies.

After Alex had given birth to her own daughter Helena at age 22, she told her sister how amazing it was and offered to carry a child for her if she ever wanted one.

And when Amy visited her sister’s US home in 2011, Alex saw her sister and future brother-in-law together and reiterated her offer.

After a lot of thought, counselling and emotion - and together with the support of Alex’s husband Mark - they started the process of creating a baby.

But as the younger sister was due to begin her medical degree in the United States, there would only be two attempts at IVF.

Using the Days’ egg and sperm, the embryo would then be implanted into Alex’s womb.

The first attempt failed, and the couple’s hopes of becoming parents faded, leaving them devastated.

The second embryo was then implanted and two weeks later, the Days got the news they had been waiting for.

“Alex was pregnant,” Amy said. “We were over the moon but petrified.”

Their unique story and a sister’s sacrifice features on The Feed on SBS2 tonight which delves into the pros and cons of surrogacy.

Despite the initial joy at the pregnancy, the couple didn’t want to get their hopes up in case something went wrong.

It was only when her sister returned to Sydney, 35 weeks into the pregnancy, that Amy began to realise this baby was real and would happen.

“It was such a mixture of emotions,” she said.

“Alex had all this time to bond with the baby but I was worried it would reject me and part of me was jealous I would never feel those kicks she felt.”

But it all went smoothly and Roxette Alexandra Iris Day was born on June 6 this year at Sydney’s Royal Hospital for Women and any anxiety the elder sister felt washed away.

But Alex, fearing she would bond too maternally with the baby, had booked herself on a flight home 10 days following the birth.

Her return was tough on her elder sister, who wanted to spend time with her but was something Alex felt she needed to do in order to recover from the birth.

“It’s bittersweet for me because I am so in love with Roxy, we’re absolutely besotted,” Amy said.

“But at the same time I know my sister is suffering a loss.”

Now happily suffering broken sleep, Amy said she would always be open with her child about how she came into the world.

She said pictures of a pregnant Alex adorn their home and she would make it clear what Roxy’s aunty sacrificed to bring her into the world.

“Roxy is a much-loved child and Alex isn’t just her aunty but her surrogate mother,” she said.

“I want her to know how much she was loved and wanted.”

The Days now face adopting Roxy from the Millers, even though they are her biological parents.

Currently, the Millers are listed on her birth certificate as Roxy’s parents, but the Days will apply to the Supreme Court to get a parentage order.

Once granted they will be listed on her birth certificate as her parents.

And while Alex feels a sense of loss, she tells The Feed she never intended to keep her sister’s baby.

And despite enduring such an emotional process, the sisters’ relationship is stronger than ever.

“We are much closer than ever before after this,” Amy said of their relationship.

“This transcends sisterhood.”

The Feed airs tonight at 7.30pm on SBS2.