That's actually exactly wrong. The loss of the fetus results in a monetary fine equivalent to property damage. It's only injury to the woman that results in an eye for an eye:
"When men fight, and one of them pushes a pregnant woman and a miscarriage results, but no other damage (to the woman) (ason) ensues, the one responsible shall be fined according as the woman's husband may exact from him, the payment to be based on reckoning. But if other damage (to the woman) ensues, the penalty shall be life for life, eye for eye, tooth for tooth, hand for hand, foot for foot, burn for burn, wound for wound, bruise for bruise."
http://en.wikipedia.org/wiki/Judaism_and_abortion