Negative health effectshttp://en.wikipedia.org/wiki/Soy_milk
However, the soy industry has also received similar criticism for reasons including:A new study has found that men who consume an average of half a portion of soy products per day are more likely to have a lower concentration of sperm. Soy contains a number of isoflavones that exert an oestrogen-like affect, like daidzein, genistein and glycitein. Some studies have indicated that high consumption of soy isoflavones could affect fertility.
The new study, published in the journal Human Reproduction, indicates that there may be a link with reduced sperm count in humans. The research team, led by Dr Jorge Chavarro of the Harvard School of Public Health in the US, analysed the diets of 99 men who attended a fertility clinic with their partners between 2000 and 2006. Those who had an average of half a portion of soy foods per day (~17mg isoflavones) there are ~3.5mg isoflavones/g soy protein - were seen to have sperm concentrations of 41 million less sperm per ml. The normal sperm concentration range is 80-120m per ml. Half a serving is the equivalent of one cup of soy milk or one portion of tofu, tempeh, or soy burgers every other day.
Soy consumption has been linked to cognitive impairment in male rats. Nevertheless the cited studies are based on rats fed with concentrated phytoestrogens and not common soy beans and it is already well known that concentrated estrogens cause negative effects in males. The common amounts of phytoestrogens in soy beans are not to be compared to concentrated phytoestrogens.
High levels of phytic acid, which binds to important nutrients like calcium, magnesium, iron, and zinc, during digestion. However, as a comparison, cow milk is known for significantly slowing down the absorption of iron and, additionally, calcium from other than dairy sources (like kale, sesame).
Although in general soy milk is not suitable for babies or infants, there exist baby formulas based on soy protein, i.e. soy milk, that are used primarily in the case of lactose intolerant children, those allergic to cow's milk or parental preference for a vegetarian or vegan diet. Farley's Soya Infant Formula is approved by the Vegan Society in the UK. These formulas are commonly named "soy milk", but contain extra carbohydrates, fat, vitamins and minerals. However, care must be taken that children with "Soy protein intolerance" are not fed soy milk.