The mother of Palestinian toddler Ali Saad Dawabsha, who was killed when suspected Jewish extremists firebombed his house, succumbed to her injuries on Sunday night.

The mother of Palestinian toddler Ali Saad Dawabsha, who was killed when suspected Jewish extremists firebombed his house, succumbed to her injuries on Sunday night, said the Zionist hospital where she was cared for and her family.

Several suspects have been arrested after the family's home in the West Bank village of Duma was firebombed with Molotov cocktails on July 31, sparking anger among the Palestinian community.

"Riham Dawabsha died in the night," a spokeswoman for the Tel Hashomer Hospital in Tel Aviv told AFP, where the 26-year-old teacher was admitted with third-degree burns covering 80 percent of her body.

Anwar Dawabsha, a family member, confirmed he had been informed of her death and said the funeral would be held on Monday in Duma.

Riham Dawabsha's death comes after her 18-month-old Ali died on the day of the attack and his father Saad eight days later. Ali's four-year-old brother Ahmad is still in hospital.

The Zionists are expected to return Riham's body to the Palestinian authorities to a checkpoint at the entrance to the occupied West Bank, from where it will be taken to her village.

The family's small brick and cement home was gutted by the fire and a Jewish Star of David spray-painted on a wall along with the words "revenge" and "long live the Messiah".

Last month, a tent was torched and Hebrew-language graffiti sprayed in a Bedouin village in the occupied West Bank in what residents and an NGO said was another suspected attack by extremists.