The Royal College of Midwives has told Good Morning Britain that level of obesity during pregnancy is a huge challenge for maternity services and the health of both the mother and the child.
They say that failing to tackle the causes of obesity in pregnancy has serious consequences for women, families and the population as a whole.
The latest figures from the Health and Social Care Information Centre show one in five pregnant women are obese and almost half are overweight.
Discussing the issue this morning we had Amber Marshall, a mum who was obese during both her pregnancies. She runs a blog called Big Birtha for expectant mums with a BMI over 30 and says the NHS and midwives are scaremongering.
Alongside her was Royal College of Midwives, Chief Executive Cathy Warwick, who believes obesity in pregnancy can have a negative impact on the health of the woman and her developing baby.