A heartwarming photo has surfaced from Brazil after a newborn baby girl beamed with happiness at the sound of her dad's voice.

Keep scrolling to read more about the beautiful moment, and to hear just how this dad achieved such an incredible bond with his unborn child.

Baby Antonella has always been a daddy's girl.

Born in Rio de Janeiro on Brazil's Father's Day, Antonella shared a unique bond with her dad even before she'd arrived into the world.

While her mom, Tarsila Batista was pregnant with her daughter...

via: Facebook

Her partner and father to her unborn child, Flávio Dantas, was determined to do everything he could.

He was incredibly excited to be a dad.

And he went to extraordinary lengths to prove his love and commitment for both his partner and his unborn child.

Flávio was keen for his baby to know how much she was already loved.

“He always told her that he loved her so much," Tarsila told the Brazilian magazine, SoNoticiaBoa, in August 2019.

The expectant dad would always talk to the unborn child.

“‘Good morning’ when I went to work," she recalled, “He said ‘I’ll always be there,’ and kept stroking my belly."

And the baby would actually respond to Flávio's voice.

“Amazingly it always seemed, at the same time every day, she started to move," Tarsila added.

This isn't an uncommon occurrence in unborn babies...

via: Getty

Research has shown that babies inside the womb can hear and respond to various different voices.

A fetus can start processing noise at around eighteen weeks...

via: Getty

And, by twenty-four weeks, its ears will have begun rapidly developing, and taking in all sorts of different sounds and noises.

And, by the third trimester...

via: Getty

The studies found that an unborn baby can begin to recognize and distinguish the difference between certain voices, usually their mothers.

So, expectant parents often take advantage of this...

And attempt to bond with their unborn child by talking and singing to them through the mother's stomach.

This is exactly what Flávio and Tarsila did...

via: Getty

And their efforts most certainly paid off.

Tarsila went into labor on August 11th...

Which, coincidentally, happens to be Father's Day in Brazil.

Baby Antonella was welcomed into the world.

And, as medical staff placed her in Tarsila's arms, Flávio leaned in to meet his daughter for the first time.

The new dad repeated the same words that he had been saying to his daughter throughout Tarsila’s pregnancy...

And he got the best response in return.

At the sound of his voice, Antonella gave the biggest smile.

via: Facebook

And, amazingly, the moment was captured perfectly on camera. “They put her on top of me, sleeping, and as soon as he spoke to her, Antonella opened her eyes and smiled," Tarsila recalled, while Flávio, overwhelmed, described his love for his baby daughter as “too big to fit inside his chest." For more on the miracle of childbirth, keep scrolling to read the not-so-cute experience one new mom had in the delivery room...