A physician sent the following in via email:
As a physician, who also happens to be an engineer, I am once again struck by how utterly uneducated this erstwhile cheerleader is - to the point that she can't even conjure up an convincing lie.
Two of the fundamental principles of physics are called, "impenetrability of matter," which, simply put, means that two objects may not occupy the same place at the same time, and "incompressibility of liquids and solids," which means neither can be squeezed into a smaller volume - unlike a gas. They take up the space they take up, and there is no way to squeeze them into a smaller volume, tight abs or not.
It is precisely the skinny women who cannot disguise their pregnancies, because the expanding uterus, containing solids and liquids, occupies a certain volume, and all surrounding tissues must move out of the way to make room, and it always gives a characteristic appearance - the so-called "baby bump." There are no exceptions to this rule. Obese women can, for a time, hide their pregnancies because, well, an extra twenty pounds looks like the last twenty pounds, but a woman with "tight abs" is the very woman who shows her pregnancy first.
Looks like Gov. Palin missed physics at those five colleges she attended.