The infant was barely breathing when his uncle brought him to the hospital in a cardboard box. He was wrapped in a blue towel, and wads of cotton were stuffed around his frail body to keep him warm.
A week later, Muhammad was still teetering between life and death. He weighed four pounds and was being fed through tubes.
Surviving even birth is a struggle in Yemen. After nearly two years of war, thousands of children and adults have died from easily treatable diseases, illnesses and injuries as the health-care system collapses.