The NHS Cumbria report found a strong link between lifestyles and unsuccessful pregnancies.
One in five mothers reviewed for the report had a body mass index (BMI) of more than 35, and a third of the mothers smoked during pregnancy.
In comparison, from the general maternity population, around one in ten mothers have a BMI of more than 35 and one in six smoke throughout their pregnancy.
A report has found that although the number of stillbirths and infant mortality cases in Cumbria are declining, more can still be done to prevent deaths.
The NHS Cumbria report shows the county has fewer perinatal deaths than the national average, but urges local hospitals and expectant mothers to help reduce the number further.
The research panel have recommended that tackling lifestyle issues such as smoking and obesity can help give the mother and child the best chance of survival.
They also suggest that local hospitals carry out more individual case reviews in order to learn from what has happened.