Trade winds blow from east to west along the equator, pushing warm surface water toward Asia and Oceania.

Every normal child develops at their own unique pace. A delay in one milestone (like walking) does not automatically indicate an abnormality if other developmental areas are on track.

In an era where pediatric texts were often disease-focused, Illingworth took a different approach. He argued that to diagnose what is pathological, one must first have an intimate understanding of what is normal. The book's focus is not on rare diseases but on the everyday challenges and variations of a normal child’s life.

: Provides practical management for common issues like feeding problems, sleep disturbances, and behavioral outbursts. Preventive Pediatrics

El Niño, which translates to "The Boy" or "The Christ Child" in Spanish, is a natural climate phenomenon that occurs when the surface temperature of the Pacific Ocean warms up more than usual, typically by 0.5-1°C. This warming of the ocean water occurs in the eastern Pacific, near the coast of South America, and can have far-reaching consequences for global climate patterns.

Since I don’t have direct access to a specific PDF by that exact name, I will assume you are referring to a hypothetical or existing work about , focusing on "Normal" conditions contrasted with El Niño/La Niña, possibly authored or compiled by Illingworth (e.g., Joseph R. Illingworth’s work on climatology or oceanography).