Pregnancy is a critical stage of life requiring urgent attention when taking a lifespan approach to obesity prevention. Excessive gestational weight gain (GWG) is highly predictive of overweight and obesity later in life for women and their offspring. This discussion describes the challenges faced by health professionals (general practitioners, midwives, allied health) in primary care in Australia when addressing GWG, presents evidence that supports re-prioritising GWG and highlights strategies that can be used to address GWG. The revised National Health and Medical Research Council antenatal care guidelines (to be formally released in early 2018) indicate it will be the responsibility of health professionals in antenatal care to initiate conversations about GWG with women. Women are open to discussing this sensitive topic and health professionals in primary care have an opportunity to be proactive in addressing barriers that have hindered conversations about GWG in the past so that women are supported to manage their weight during pregnancy.