Around 5% of all pregnant women in the UK - more than 38,000 - are severely obese, putting them and their babies at risk, according to a new study.
A stillbirth is twice as likely if the mother is severely obese.
Very overweight mothers are also at greater risk of blood clots, high blood pressure and bleeding after birth.
And the researchers for the Centre for Maternal and Child Enquiries (CMACE) found many maternity units were not set up to care for very overweight women.
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