Map of Simcoe Muskoka

Pregnancy and Before

Gestational Weight Gain

Females of Reproductive Years
Pre-Pregnancy BMI
Gestational Weight Gain
Technical Notes

Gestational weight gain can be defined as the amount of weight gained between conception and just before the birth of the infant. In 2009, the Institute of Medicine (IOM) released guidelines that specify the amount of weight gain that is acceptable, based on the mother’s pre-pregnancy BMI. Staying within these guidelines during pregnancy will likely result in more healthy pregnancies and birth outcomes.

HealthCanada_GWGRecommendations

Women who gain an excessive amount of gestational weight according to the Gestational Weight Gain recommendations may be at higher risk of:

Additionally, infants born to mothers that gain more weight than recommended may be at increased risks of:

Infants born to women who gain less than their recommended gestational weight gain range may be at higher risk of:

Females of Reproductive Years

According to the CCHS in 2013-2014, approximately half (45% (37.3%, 53.3%)) of Simcoe Muskoka females between the ages of 20 and 44 years were considered normal weight (BMI 18.5-24.9), one-third (34% (26.8%, 41.6%)) were overweight (BMI 25-29.9) and one-in-five (20% (15.8%, 25.2%)) were obese (BMI >=30). These figures were similar to the overall provincial averages.

160426BMIClassFemalesReproYrs

Pre-Pregnancy BMI

According to BORN, in 2016 approximately half (48.7% (47.3%, 50.1%)) of new Simcoe Muskoka mothers began their pregnancies with a ‘normal’ BMI (BMI 18.5-24.9), significantly lower than the overall rate for Ontario (52.4% (52.2%, 52.7%)). However, significantly more Simcoe Muskoka mothers began their pregnancies at an obese BMI (BMI ≥ 30.0) (23.1% (20.8%, 22.7%)) compared to Ontario mothers (17.9% (17.8%, 18.1%)).

PrePregBMI_2014

Gestational Weight Gain

Around half (49.5% (47.9%, 51.0%)) of Simcoe Muskoka mothers gained more than the recommended amount of weight during their pregnancies. Fewer than one in three mothers (30.4% (29.0%, 31.9%)) reported weight gain within the recommendations set out by the Institute of Medicine.

GWG_2014

Nearly two-thirds of women who began pregnancy as overweight (63.9% (60.9%, 66.8%)) or obese (63.7% (59.4%, 67.8%)) gained in excess of their recommended gestational weight gain range. Approximately forty percent (39.9% (37.8%, 42.0%)) of women who started their pregnancy with a normal BMI or who started their pregnancy underweight (37.4% (31.0%, 44.1%)) also gained an excess amount of weight during pregnancy.

GWGxPrePregBMI_2014

For more information on having a healthy pregnancy, please visit the health unit's website on gestational weight gain.

Technical Notes

A high proportion of data (~20%) for BMI and weight gain is missing. Caution should be used when interpreting the results.

There are currently no evidence-based guidelines for gestational weight gain among women carrying three or more fetuses, women with a pre-pregnancy BMI ≥35.0, or underweight (BMI <18.5) women carrying twins. The results presented here are based on the exclusion of pregnancies that meet those criteria.