An eight-month-old baby girl has been raped, allegedly by her cousin, in the Indian capital Delhi.
Police say she is in a critical condition after being admitted to hospital on Sunday. They have arrested the 28-year-old cousin.
Delhi Commission for Women chief Swati Maliwal, who visited the girl, described her injuries as "horrific".
The debate over sexual violence in India has grown after the fatal gang rape of a female student in 2012.
The rape of the baby girl happened on Sunday but came to light on Monday after local media reported it.
Ms Maliwal tweeted that the baby had undergone a three-hour operation and that her cries could be heard in the hospital.
Is this a new low for India?
Geeta Pandey, BBC News, Delhi
This distressing case of assault on an infant has shocked India and made national headlines. The extent of her injuries has horrified many and prompted them to wonder whether we have reached a new low.
But a look at the statistics, compiled by the government, shows that such crimes are not uncommon.
And worryingly, their numbers are rising rapidly.
According to the latest National Crime Records Bureau data, 2016 saw 19,765 cases of child rape being registered in India - a rise of 82% from 2015 when 10,854 cases were recorded.
A couple of years ago, an 11-month-old was kidnapped by a neighbour while she slept next to her mother and brutally raped for two hours.
And in November 2015, a three-month-old was kidnapped and assaulted in the southern city of Hyderabad.
How are people reacting to the news?
Ms Maliwal described what she heard when she visited the hospital where the baby was being treated.
"Her heart-rending cries could be heard in the intensive-care unit of the hospital. She has horrific injuries in her internal organs," she tweeted after visiting the hospital on Monday night.
She posted another tweet expressing her anguish.
"What to do? How can Delhi sleep today when 8 month baby has been brutally raped in capital? Have we become so insensitive or we have simply accepted this as our fate?"
She also tweeted a direct appeal to Prime Minister Narendra Modi that "stricter laws and more police resources" were needed to protect girls in the country.
Others joined her, expressing shame and anger over the horrific crime.
8 month old baby girl sexually assaulted in New Delhi this has left the country transfixed. A monstrous act needs the most exemplary punishment. When will this rape culture end? These kind of incidents severely puts a dent in my heart!! #Shame #Disgraceful— Aishwarya sakhuja (@ashsakhuja) January 30, 2018
woke up to this disgusting and disturbing news. An 8 month ? 8 month? 😐— Rupinder Kaur (@RupinderKW) January 30, 2018
8-Month-Old Raped Allegedly By Cousin In Delhi, Needed Three-Hour Surgery - NDTV https://t.co/VQvzDHaKyo
Has the situation for women improved in recent years?
The 2012 gang rape and murder of the 23-year-old student on a bus in Delhi sparked days of protests and forced the government to introduce tougher anti-rape laws, including the death penalty.
There has also been a change in attitudes - sexual attacks and rapes have become topics of living room conversations, and not something to be brushed under the carpet, our correspondent says.
However, brutal sexual attacks against women and children continue to be reported across the country.
Recently released National Crime Records Bureau statistics for the year 2016 show crimes against women continue to rise.
But what is heartening is the refusal of women to give up their fight, our correspondent adds.
What is the scale of child rape in India?
- Police recorded 19,765 cases of child rape in 2016
- 240 million women living in India were married before they turned 18
- 53.22% of children who participated in a government study reported some form of sexual abuse
- 50% of abusers are known to the child or are "persons in trust and care-givers"
Sources: Indian government, Unicef