Twelve Hours' Sleep by Twelve Weeks Old: A Step-by-Step Plan for Baby Sleep Success Twelve Hours' Sleep by Twelve Weeks Old: A Step-by-Step Plan for Baby Sleep Success ($16) is an incredibly popular book. Through a series of steps that involve decreasing milk volume consumed at night, you can be well on your way to 12 hours of uninterrupted sleep. Image Source: amazon.com Twelve Hours' Sleep by Twelve Weeks Old: A Step-by-Step Plan for Baby Sleep $16 from amazon.com Buy Now