The rate of twin births has risen 79 percent over the last three decades, and continues to increase. A mom of fraternal twins and a national guru on having two, Natalie Diaz launched Twiniversity, a supportive website with advice from the twin-trenches.

What to Do When You're Having Two is the definitive how-to guide to parenting twins, covering how to make a Birth Plan checklist, sticking to one sleep schedule, managing double-duty breastfeeding, stocking up on all the necessary gear, building one-on-one relationships with each child, and more.

Accessible and informative, What to Do When You're Having Two is the must-have manual for all parents of twins.