Never too early to read the stuff the baby. Plain cardboard book with colorful pictures may interest him, as well as books about people, animals and familiar objects. Reading at bedtime, before dinner, and at any time when you are in the mood for an exciting experience for you and your baby. In addition, it stimulates the curiosity of the child's imagination and love of language.
By 15 months your child's vocabulary may have about 10 active words and a lot more people that he understands. He can also perform simple requests such as "Bring a book" or "Come to Mama." But the most important thing is that he is gaining vocabulary at a rate of 2 to 3 words in a week and reading contributes significantly to this process.