Does the thought of sticking to a rigid baby sleep schedule feel more stressful than helpful? When it comes to baby sleep schedules, parents often fall into one of two camps. They either feel like they have to be rigid or totally flying by the seats of their pants. But here’s the good news: There is a middle ground. And perfection is not required to rock this. If you've never heard of the 80/20 Rule, it could be your new best friend when it comes to creating a flexible baby sleep schedule. As a mom of four, the 80/20 Rule gives me permission to be imperfect. The 80/20 Rule is…