Everybody Has Everything by Katrina Onstad. The book is being released by Grand Central Publishing on June 25, 2013.
Amazon says this about the book: After years of unsuccessful attempts at conceiving a child, Ana and James become parents overnight, when a terrible accident makes them guardians to 2 year-old Finn. Suddenly, two people who were struggling to come to terms with childlessness are thrust into the opposite situation-responsible for a small toddler whose mother's survival is in question.
Finn's crash-landing in their tidy, urban lives throws into high relief some troubling truths about their deepest selves, both separately and as a couple. Several chaotic, poignant, and life-changing weeks as a most unusual family give rise to an often unasked question: Can everyone be a parent?