Additional District and Sessions Judge Poonam R Joshi, while pronouncing the quantum of sentence, also imposed a fine of Rs 3.05 lakh each in the case.
"The court today pronounced life imprisonment for both the brothers in the rape case," said cousel Manjit Singh who represented the elder brother.
Public prosecutor Atul Sethi said, "They will stay in jail till death."
"This is a very good decision and the verdict will be a lesson for those who indulge in such heinous crimes," he said.
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On October 31, the court had held the maternal uncles guilty of raping the girl.
They had been charged under Section 376(2)(f)(i) (rape on a woman when she is under twelve years of age) of the Indian Penal Code and Section 6 (aggravated penetrative sexual assault) of the Protection of Children from Sexual Offences Act (POCSO).
The crime came to light in July when the girl was taken to a hospital after complaining of stomachache and was found to be over 30 weeks pregnant.
The child was told by her family and the doctors that she had a stone in her stomach that had to be removed.
It was earlier suspected that her elder uncle had fathered the baby who was delivered through C-section at a government hospital here.
The twist in the case came this month when a fresh DNA test showed the younger maternal uncle to be the father of the child.
The police had maintained that both her uncles had sexually exploited her.
Earlier, police had said the girl was repeatedly raped allegedly by her elder maternal uncle for several months.