A little girl whose biological parents were jailed for horrifically abusing her as a baby has now been adopted by a new family.

Faith Mason was dubbed Baby Faith back in 2013 when she was found in Southeast Texas with injuries so severe authorities had compared it to falling from a two-storey building.

Now three years on, Faith is still recovering but has a permanent home after being official adopted by her new family on March 10.

The little girl has been living with her adoptive parents and three teenage siblings for the past six months, according to the Texas Department of Family and Protective Services.

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Faith is still recovering from her horrific abuse injuries, but authorities say she has already improved much more than anticipated.

During a court hearing last year, prosecutors said Faith was still being fed through a feeding tube and her left arm had still not healed properly in the three years since the abuse was uncovered.

Faith was taken to a hospital in Southwest Texas back in 2013 by her mother Christine Johnson.

An emergency room nurse who was on duty when Faith was brought in called the abuse the worst case she had ever seen, the Port Arthur News reported.

Doctors found she had suffered at least 40 broken bones and fractures, including two broken arms, two broken legs, a broken neck and dislocated shoulder.

They said many of the one-month-old's fractures were about three weeks old at the time she was examined.

The little girl had an IV drip placed in her neck as doctors tried to stabilise her.

Her injuries were so extensive, a team of doctors from a children's hospital in Houston had to fly down to help treat her.

Her biological parents, Christine Johnson and Darrell Mason, were both charged with child abuse.