Babies fed soy-based formula have 13,000 to 22,000 times more estrogen compounds in their blood than babies fed milk-based formula. Infants exclusively fed soy formula receive the estrogenic equivalent of at least four birth control pills per day.
Male infants undergo a testosterone surge during the first few months of life, when testosterone levels may be as high as those of an adult male. During this period, baby boys are programmed to express male characteristics after puberty, not only in the development of their sexual organs and other masculinity traits, but also in setting patterns in the brain characteristic of male behavior.
In animals, studies indicate that phytoestrogens in soy are powerful endocrine disrupters. Soy infant feeding -- which floods the bloodstream with female hormones that inhibit testosterone -- cannot be ignored as a possible cause of disrupted development patterns in boys, including learning disabilities and attention deficit disorder.
Male children exposed to DES, a synthetic estrogen, had testes smaller than normal on maturation and infant marmoset monkeys fed soy isoflavones had a reduction in testosterone levels up to 70 percent compared to milk-fed controls.
Almost 15 percent of white girls and 50 percent of African-Americans girls show signs of puberty, such as breast development and pubic hair, before the age of eight. Some girls are showing sexual development before the age of three. Premature development of girls has been linked to the use of soy formula and exposure to environmental estrogen-mimickers such as PCBs and DDE. Intake of phytoestrogens even at moderate levels during pregnancy can have adverse affects on the developing fetus and the timing of puberty later in life.
http://articles.mercola.com/sites/articles/archive/2010/12/04/soy-dangers-summarized.aspx
http://naturalhygienesociety.org/diet-veganbaby.html
