Would-be mothers looking for precise, accurate information from a reputable source will appreciate this mammoth pregnancy guide from the celebrated Mayo Clinic. The volume actually provides much more information than most parents will need: week by week accounts of the baby’s development, entries on how pregnancy can be affected by dozens of previous health conditions (such as HIV and diabetes), self-care tips for side effects like nausea and back pain, sidebars that explain the difference between identical and fraternal twins, etc. But the book contains at least one feature that most pregnant women will find indispensable: charts that indicate how to handle "troublesome signs and symptoms" during each three week period. For example, if a woman has slight spotting during the first four weeks of pregnancy, the chart tells her to notify a doctor during her next hospital visit. But if she has any bleeding at all during weeks 29 to 32, the chart indicates that she should tell her doctor immediately. Another stellar feature is the book’s even-handed series of "decision guides," which help parents make those hard (and even guilt-inducing) choices about breastfeeding, circumcision and whether or not to go back to work. Some parents may find the book’s cool, no-nonsense tone intimidating, or even scary, but when deciding what to do about mid-term cramps or pain, most readers will find great reassurance this volume’s carefully vetted facts.