Final answer:
The most readily available intervention for promoting the recovery of preterm babies in developing countries is kangaroo care, which involves placing the baby on the bare chest of the parent.
Step-by-step explanation:
The most readily available intervention for promoting the recovery of preterm babies in developing countries is skin-to-skin "kangaroo care". Kangaroo care involves placing the baby on the bare chest of the parent, providing warmth, comfort, and bonding. It has been shown to have numerous benefits for preterm babies, including stabilizing body temperature and heart rate, improving sleep patterns, and promoting breastfeeding.