Frans Plooij, Ph.D is the author of the international bestseller The Wonder Weeks and one of the worlds top specialists in infant/child development and parent-baby interactions. His book, based on 35 years of extensive research, describes in easy-to-understand terms the incredible developmental changes that all babies go through during their first 20 months of life. Following Dr. Plooijs advice and insight in the babies changing brain, parents all around the world have been better prepared (often within a week or two) for the often drastic behavior that marks a new change in their babys development, the new skills that emerge with each leap and how to get the most out of these wonder weeks.