Warning: The following images may be upsetting to some viewers.

Snow covers the ground and buildings in Madaya, Syria on Jan. 25, 2016. Madaya Mom told ABC News, "Thankfully I was able to buy 200-pounds of firewood - it cost us $100. Before the siege one ton of firewood cost $200."

A nine-month-old girl is evaluated for malnutrition on Jan. 21, 2016 in Madaya, Syria. According to a medic who provided the image, the red reading on the instrument indicates acute malnutrition.

A baby boy is pushed in a cart because, according to a medic working in the town, his mother, weakened by the lack of food, is no longer able to carry him in Madaya, Syria on Jan. 23, 2016.

An elderly couple waits for a ride from the medical center in Madaya, Syria.

A picture taken in early January shows a 16-year-old boy who, according to a medic working in the town, was eventually evacuated from Madaya, Syria to Damascus because his condition was so acute. He died from malnutrition on Jan. 23, 2016.

Residents of Madaya, Syria line up on Jan. 23, 2016 outside one of the only remaining pharmacies in the town.

An infant suffering from acute malnutrition wears a diaper made from a plastic bag wrapped in a rag due to the lack of diapers in Madaya, Syria.

A photo provided to ABC News shows a young girl who was brought to the last remaining health center for care in Madaya, Syria, Jan. 21, 2016.

A photo provided to ABC News shows an emaciated man being examined at the last remaining health clinic in Madaya, Syria, Jan. 17, 2016.

A photo provided to ABC News shows a group of children at the last remaining health center in Madaya, Syria, Jan. 17, 2016.

Pieces of the closet from the house of "Madaya Mom" were shredded to use for heating in a photo provided to ABC News on Jan. 20, 2016.

A window in the home occupied by "Madaya Mom" and her family is covered with plastic to preserve heat after the glass was blown out by shelling.

On Jan. 14, 2016, a young child is examined at a make-shift hospital in Madaya where there were only two doctors and two health professionals during a UNICEF visit. The UNICEF team and staff of the World Health Organisation were able to screen 25 children under five for malnutrition. Twenty-two of the children showed signs of moderate to severe malnutrition.

Syrian pro-government forces stand at the entrance of the besieged rebel-held Syrian town of Madaya as they wait for a convoy of aid from the Syrian Arab Red Crescent on Jan. 14, 2016.

Residents who say they have received permission from the Syrian government to leave the besieged town, walk past Syrian Army soldiers as they depart after an aid convoy entered Madaya, Syria, Jan. 11, 2016.

People wait to leave the besieged town of Madaya, northwest of Damascus, Syria, Jan. 11, 2016.

People wait for the arrival of an aid convoy on Jan. 11, 2016 in Madaya, Syria.

A young boy waits to be evacuated from the besieged town of Madaya, northwest of Damascus, Syria, Jan. 11, 2016.

A convoy containing food, medical items, blankets and other materials are delivered to the town of Madaya in Syria, Jan. 11, 2016.

Lebanese Sunni Muslims gather at the Masnaa crossing on the Lebanon-Syria border, blocking the road leading to Damascus, in protest of the ongoing siege imposed on the Syrian town of Madaya, Jan. 8, 2016.