The Army Medical Services are responsible for promoting health in the military workplace. A survey of the potential health risks in the workplace to British Army servicewomen who are pregnant, or who breastfeed, was carried out. It was found that there was a total of 30 major workplace hazards to pregnant or breastfeeding servicewomen, and that medical guidance in this area was lacking. A Medline literature search on these hazards, was compiled, and an overview of the nature and extent of the military problem, together with a brief policy recommendation applying to each hazard. Guidelines based on these recommendations were distributed to primary care and obstetric unit medical officers in all three Armed Services. It is intended that the guidelines will assist Service doctors in giving informed advice on the avoidance of military occupational risks to pregnancy and to lactation.