The course can be purchased at any time! Once you purchase the course you will receive instructions to begin your 5 month membership. Then you will be able to login and create your account at your convenience. The 5 months membership begins when you create your account not when you make your purchase. Most families choose to begin their membership as early as about a month before their little one arrives. While the course is designed to help your baby sleep from 0-16 weeks adjusted, it is recommended to begin the course by 12 weeks adjusted to fully benefit from the content.