Children are a very interesting target for companies and retailers. In total, it represents 75 billion dollars per year. Some recent studies showed that children are 'consumers-decision maker' younger and younger. They can generate by themselves more than 3.2 billion dollars every year. Their prescriptions are very specific in terms of brands and functions of products. Understanding the relationships between products and children is fundamental for companies today. Their prescriptions are very specific in terms of brands and functions of products. Children are very different from other types of targets. They are not well known by marketers today. They have their own concerns, their own interests. In fact, they have their own furniture, toys, rooms... This is how their character is developed. It determines taste and so, preferences for a product instead of another. Children do not change with time, but they adapt themselves to their environment. For instance, today children are able to use digital media which did not exist a decade ago. What I suggest in this book is to describe who children are, how they evolve, and give insights on how to approach them (study, MIX, offer...).