The woman in India says her "life feels complete"
Daljinder Kaur and her 79-year-old husband became parents last month following two years of treatment at a clinic in the northern state of Haryana.
the National Fertility and Test Tube centre said the baby was conceived using the couple's own egg and sperm and, despite being very small at birth, weighing 4.4lbs, was now "healthy and hearty".
Kaur said she did not believe she was too old to be a first-time mother and said she felt very well and fit enough to cope. She said she and her husband of 46 years had almost given up hope of ever having a child.
"My life feels complete now. I am looking after the baby all by myself, I feel so full of energy. My husband is also very caring and helps me as much as he can," said the new mother.
Anurag Bishnoi, who runs the fertility clinic, said he was initially unsure about going ahead with the treatment, but tests indicated the mother would be able to carry the unborn baby.
"I first tried to avoid the case because she looked very frail. Then we made her undergo all the tests and once all the results were okay we went ahead," said Dr Bishnoi.
The case is not the first in India, with a 72-year-old woman from Uttar Pradesh state reportedly giving birth to twins in 2008, also through IVF.