Two men charged with the rape of a ten-month-old baby girl had sex with her and took photographs of her private parts over a three hour period of abuse, police allege.

One of the men is the girl's father while the other is his boyfriend, the Sydney Morning Herald reported.

The men, both aged 50, were extradited from Victoria to NSW on Tuesday on multiple child pornography charges after police raids in Victoria uncovered terrabytes of photos and videos.

The raids also uncovered a conversation allegedly between the men planning the abuse, which read: 'We're going to go away to play with the baby for a few days… I am hoping that makes me feel better'.

Police allege the pair sexually assaulted the baby girl over a period of three hours at a home near Bathurst in regional NSW on April 19, 2015.

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Two 50-year-old men (pictured) have been extradited from Victoria to NSW charged with raping a 10-month-old baby girl

According to the Sydney Morning Herald, police said the father's partner bragged about abusing the baby - who was born in 2014 - over Skype to an associate.

Officers will also allege that in a conversation with an associate two days later, the partner lamented over the fact he and the baby's father 'did not have enough time to do everything we wanted'.

In another conversation via Skype, the man also allegedly said he and the baby's father were going away with the child for a few days, adding: 'incest turns me on so much'.

The baby was allegedly in the care of the two men while the child's mother was out at a training course for a few hours.

On Thursday, Detective Chief Inspector Peter Yeomans, of the NSW State Crime Command's Child Abuse Squad described the abuse as 'abhorrent'.

'The sexual assault or alleged sexual assault of a ten-month-old child is beyond belief,' he said.

Mr Yeomans also said that the girl was 'fine' and had been placed into care.

Court documents show one man is facing seven charges including having sexual intercourse with a child under ten years old and using a child under ten years of age for the production of child abuse material when he took photographs of her private parts.

The men, pictured here with police, allegedly assaulted the girl in April, 2015 at her home in Bathurst

Victoria Police alerted NSW Police to their possible involvement in a child sex offence when they were looking into child exploitation material

He is also charged with possessing, soliciting, transmitting, publishing and promoting child pornography.

The second man is charged with having sexual intercourse with a child under ten years of age, inciting the commission of having sexual intercourse with the child, and producing, disseminating or possessing child abuse material.

They did not appear when their case was briefly brought up at Waverley Local Court on Thursday.

The men did not apply for bail on Thursday and it was formally refused, meaning they will remain behind bars until the case returns to Central Local Court on Tuesday July 12.

The court heard one or both men may make a bail application at that time.

On Tuesday the men were arrested in the Melbourne suburb of Ivanhoe by NSW police, following an investigation by Victorian police into child pornography.

The two men have been remanded in custody to face Central Local Court on July 12

One of the men is charged with seven different offences while the other is charged with two counts of sexual intercourse and one count of making child exploitation material