Weight gain during pregnancy: an update on current challenges and practical considerations

Gestational weight gain (GWG) can be defined as the total weight gained throughout pregnancy and is required for healthy fetal growth; however, gaining excessive weight during pregnancy has been linked with several adverse effects. This review aims to consider the evidence on weight management during pregnancy, with a focus on the key challenges surrounding GWG and the practical considerations related to assessing weight changes. It is estimated that nearly 50% of women gain excessive weight during pregnancy; nevertheless, this can be difficult to quantify due to the lack of global consensus on recommended GWG guidelines. Currently, there are no GWG guidelines in the UK and Ireland, as reiterated in the recent National Institute for Health and Care Excellence guidelines, due to the lack of evidence about what the optimal total weight change in pregnancy should be. This is further complicated by the conflicting results of interventions aimed at preventing excessive GWG and their resultant inconsistent effects on adverse pregnancy outcomes. Accurate calculation of GWG requires measurement of pre-pregnancy weight and weight prior to the onset of labour. However, several practical considerations are associated with obtaining these weights, as in practice, estimated or self-recalled weights are often used as an alternate, thereby introducing variability into the measurement of GWG and the potential for inaccuracies in analysis. These limitations highlight the need for a more uniform approach in assessing GWG. The WHO is in the process of developing global GWG standards, and this could potentially establish a uniform gold standard for assessing GWG and reintroduce routine weighing.