Anaemia is either because of a reduction in the quantity of blood in the body or in the haemoglobin level. The amount of blood in the body is evaluated by calculating the level of haemoglobin either in gm per 100 ml or as a percentage. Antenatal care makes sure that normal haemoglobin levels are retained all over pregnancy.

A disproportionate blood loss at the time of delivery may also result in anaemia in the puerperium. On the other hand, if the amount of blood loss is beyond the limit then postpartum anaemia is likely to develop. Postpartum haemorrhage is now reasonably uncommon, even though some instances are obligatory.