Background: It is well accepted that gestational weight gain (GWG) outside of the Institute of Medicine recommendations is a modifiable risk factor for pregnancy complications, regardless of a woman’s pre-pregnancy body mass index. Objectives: Given that not all prenatal healthcare providers (HCPs) are aware of these guidelines nor discuss them with their patients, this thesis sought to examine counselling practices and evaluate a pilot knowledge translation tool for the improvement of such counselling. Methods: 1) A literature review was conducted to assess current prenatal GWG counselling practices between patients and HCPs; 2) an electronic survey was conducted to determine patients’ perceptions of GWG counselling and whether certain patient characteristics increase chances of counselling; 3) a quasi-experimental study was implemented to evaluate the Canadian Obesity Network’s 5As of Healthy Pregnancy Weight Gain tool. Results: GWG counselling was often infrequent and inaccurate. Women of higher socioeconomic status, older age, nulliparous, history of dieting, low physical activity and those categorized with overweight/obesity were more likely to receive GWG advice. The 5As of Healthy Pregnancy Weight Gain Tool is effective at initiating Ask and Advise components of HCP-mediated GWG counselling, but work is still needed to improve all other components of the 5As (Assess, Agree, Assist). Conclusions: Weight gain counselling is an essential component of prenatal healthcare, but discussions between HCPs and patients is inconsistent. Future steps include the development of GWG knowledge translation tools and improving GWG education for HCPs.