There is an interesting animal study in which human material was incorporated into mice, suggesting that the commonly-used and apparently safe pain-reliever, paracetamol, can, if taken as prolonged high doses in pregnancy, cause problems in male foetuses (http://www.theguardian.com/lifeandstyle/2015/may/20/paracetamol-use-pregnancy-male-foetus-testosterone-study). It seems to suppress the normal early surge of testosterone that 'masculinizes' those babies. It reportedly can increase the incidences of cryptorchidism where the testes fail to descend. The range of materials that impact on human reproduction seem to be ever increasing.
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