4BabyVision Which One? is based on Baby Science which finds that, from as young as 3-months old, babies often quickly look at the odd-one-out. The odd ones out in this book have been chosen so they are likely to jump out to young babies. Building on the success of Look Touch Learn, BabyVision has been developed with a leading university baby lab. Each book in the new BabyVision series is designed to promote early visual development through targeted stimulation, using topics such as repetition, optical illusions, odd one out and sequencing. A bold and contrasting palette of colours is optimally suited to infant retinas, and looks completely different to more traditional books for babies.