Another reason to exclusively breastfeed and then introduce solids, not
toddler formulas:
Formula fed infants are being overexposed to fluoride and its toxicity.
National Academy of Science, NAS, .7ppm cumulative daily intake level has
never been adopted by the EPA. Tap water is usually artificially set at
1.0ppm.  To read the whole report by Environment Working Group, EWG.org:
Judy Ritchie 

partial quotes and graph:

The analysis applies to all babies in the metropolitan areas served by these
water systems, including breast-fed babies who are protected from fluoride
in tap water because their mothers' bodies filter fluoride out of breast
milk. The figures also include babies who are both breast- and bottle-fed, a
phenomenon that increases as babies grow. At birth about 59 percent of
babies are exclusively breast-fed. By 6 months of age this percentage is
reversed, and about 64 percent of babies are exclusively bottle-fed.

http://ewg.org/issues/fluoride/20060322/index.php

In just one example of the potential health risks from water fluoridation,
the committee cited concerns about the potential of fluoride to lower IQ,
noting on page six of the report that the "consistency of study results
appears significant enough to warrant additional research on the effects of
fluoride on intelligence." IQ deficits, the committee noted, have been
strongly associated with dental fluorosis, a condition caused by fluoride in
tap water (NAS pg 175).
The committee's findings support Environmental Working Group's (EWG's)
recommendation that fluoride exposure should be limited to toothpaste, where
it provides the greatest dental benefit and presents the lowest overall
health risk.

EWG analysis shows infants overexposed
A new EWG analysis of fluoride exposure to bottle-fed babies supports the
concerns the NAS committee raised.
EWG's analysis shows that in 25 of the 28 largest cities in the U.S.,
fluoride levels in tap water alone will put 8 to 36 percent of all babies up
to 6 months of age over the safe dose of fluoride on any given day. "These
elevated early life exposures put children at risk for precisely the health
problems that the NAS committee is concerned about," said Dr. Tim Kropp,
toxicologist and senior scientist at EWG.
The safe dose for fluoride in the EWG assessment is the 0.7 milligrams per
day dose developed by the Institute of Medicine (IOM) of the NAS in 2004
(IOM 2004). This dose applies specifically to children under 6 months of
age, and has not been officially adopted by the EPA.

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