It seems appropriate to add these links to this thread, since these issues have been touched on in this thread. The first concerns the belief that breast feeding makes breasts sag.
Contrary to popular belief, breastfeeding does not make breasts sag, according to research carried out on US women seeking plastic surgery.
http://news.bbc.co.uk/1/hi/health/7082473.stm
The second article suggests that 90% of children can have their intelligence increased just through being breast fed.
A single gene influences whether breastfeeding improves a child's intelligence, say London researchers.
Children with one version of the FADS2 gene scored seven points higher in IQ tests if they were breastfed.
But the Proceedings of the National Academy of Sciences study found breastfeeding had no effect on the IQ of children with a different version.
The gene in question helps break down fatty acids from the diet, which have been linked with brain development.
Seven points difference is enough to put the child in the top third of the class, the researchers said.
Some 90% of people carry the version of the gene which was associated with better IQ scores in breastfed children.
http://news.bbc.co.uk/1/hi/health/7075511.stm