Nairobi, July 29 -- Ask any preschool teacher and they'll tell you that their classroom is a vibrant environment, filled with the sounds of giggles, games, music, clattering feet and the occasional tears. Is it overwhelming? Yes, sometimes.

But this bustle of play-based activity is an essential ingredient in childhood learning.

Giving children a strong start

The first few years of a child's life are critical because this is when the brain develops at its fastest rate and when children are most receptive to learning.

Numerous studies, including the OECD's International Early Learning and Child Well-being Study, have highlighted the importance of giving children a strong start in the early years to improve their educational outcomes and...