This book has amazing pictures that show everything from the sperm and egg to each stage of prenatal development. The text also does a really great job of explaining the science of what is going on, far better than any general pregnancy book. Some of the pictures are a bit on the graphic side, but even just flipping through this at the library or bookstore is an amazing experience.

This book mostly focuses on how to manage your nutrition to have the best possible outcomes for both mom and babies during a pregnancy with twins, triplets, or more. It also has some more general information about multiple pregnancies, but the nutrition information is the meat here -- and is absolutely worth it. Even worth a look for moms of "just one"!

This is the only useful book I've seen about breastfeeding after breast reduction surgery, and it really does a great job. The majority of the book would really be useful for women who have had any type of breast surgery and are worried about breastfeeding successfully. Some of the information in the book is now out-of-date, and the author has updated information on the website (www.bfar.org).

Easily the best baby name book out there, and is especially useful if you are either having multiples or are looking for a name for a 2nd/3rd/etc child. For each name in the book, it also has suggestions of good sibling names that go along well. I also appreciate that it has a number of unique names, but doesn't try to cram in 1,000,000 names and overwhelm you with mostly useless choices.