Hunger is most acute in northern Gaza, which has been isolated by Israeli forces and has suffered long cutoffs of food supplies. At least 20 people have died from malnutrition and dehydration at the north’s Kamal Adwan and Shifa hospitals, according to the Health Ministry. Most of the dead are children — including ones as old as 15 — as well as a 72-year-old man.

At the Emirati Hospital in Rafah, 16 premature babies have died of malnutrition-related causes over the past five weeks, one of the senior doctors told The Associated Press.

Recent airdrops of aid by the U.S. and other countries provide far lower amounts of aid than truck deliveries, which have become rare and sometimes dangerous. UNRWA says Israeli authorities haven’t allowed it to deliver supplies to the north since Jan. 23. The World Food Organization, which had paused deliveries because of safety concerns, said the military forced its first convoy to the north in two weeks to turn back Tuesday.

At Emirati Hospital, Dr. Ahmed al-Shair, deputy head of the nursery unit, said the recent deaths of premature babies was rooted in malnutrition among mothers. Malnourishment and extreme stress are both factors causing premature, underweight births, and doctors say anecdotally cases have risen during the war, though the U.N. does not have statistics.