KABUL, Afghanistan — Amena, 7 months old, lay silently in her hospital crib amid the mewling of desperately ill infants in the malnutrition ward.Her mother, Balqisa, had brought the child to Indira Gandhi Children’s Hospital in Kabul, Afghanistan’s capital, the night before. “Her body was so hot,” she said, stroking her daughter’s emaciated leg.The baby…