Pregnancy-associated osteoporosis is an uncommon condition. It predominantly affects thinly built, primigravid, lactating women. These patients can sustain vertebral fractures with minimal or no trauma, resulting in significant morbidity. The association with hypercalcaemia is rare and typically occurs during the first few months postpartum, while lactating. This condition is, however, relatively benign and patients can expect to return to normal bone mineral density 6-12 months after breast-feeding has stopped.