Age range 0 to 3 Set the children in your life on a lifelong path to learning with the next installment of the Baby University board book series. Full of scientific information, this is the perfect book to teach complex concepts in a simple, engaging way. Germ Theory for Babies is a colourfully simple introduction for youngsters (and grownups!) to what germs are, how they spread, and how we can keep ourselves and others healthy. It's never too early to become a scientist!