"With nearly 4 million downloads, The Wonder Weeks app is a must-have. The revised and updated book, with exclusive material, is the perfect companion or gift. What to expect the first 20 months? Leaps, leaps and more leaps! ten in all. Welcome to the fully-updated and revised 6th edition of the book-with 30% new material-that made "leaps" the buzzword for parents of young children worldwide. Fussy at 5 weeks? Cranky at 19-weeks? Clingy at a year?...