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.
More top news
It is the final chance for people to have their say in Stage Two of the public consultation into a new nuclear power station in Cumbria.
New figures have revealed 321 people died in accidental drownings in 2015 nationally.
A progress report on fresh plans to bring mining to West Cumbria will be available to the public tthis weekend in Whitehaven