HealthcareWomen advised to wait at least two years after...

Women advised to wait at least two years after weight loss surgery before trying for a baby

bariatric surgery
Credit: Unsplash/CC0 Public Domain

Women who have had weight loss surgery should wait at least two years before trying for a baby, new research presented at the European Congress on Obesity (ECO) in Maastricht, the Netherlands (4-7 May), suggests.

Bariatric surgery is increasingly common in women of reproductive age and reduces the risk of obesity-related complications, such as pre-eclampsia and , in pregnancy.

Women are, however, more likely to have a baby who is very underweight (small for gestational age, SGA), after bariatric surgery.

Small for gestational age neonates are more at risk of a range of problems, including hypothermia, hypoglycaemia, infections and neonatal asphyxia, than those of .

As a result, women are generally advised to wait at least 12 months after bariatric surgery before trying for a baby. Many European countries, including the UK, recommend waiting two years after and 12 months after other types of bariatric surgery.

The optimal bariatric surgery-to-conception interval (BSCI) has not, however, been determined.

To find out more, Dr. Ana Carreira and Dr. Bárbara Araújo, Department of Endocrinology and Metabolism, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal and colleagues carried out a retrospective study of 48 pregnancies after bariatric surgery.

The women were 34.3 years old, on average, at conception, and had an average BMI of 30.9.

They had had the following types of bariatric surgery: (37.5%), (35.4%), gastric banding (22.9%) and biliopancreatic diversion (4.2%).

14.6% of babies were conceived less than 12 months after bariatric surgery, another 14.6% at 12 to 24 months after surgery and 70.8% had a BSCI of over 24 months.

Average was 2980g and 26.3% of babies were SGA (defined in this study as one that is smaller than more than 90% of babies born at the same number of weeks of pregnancy).

Time from bariatric surgery to conception was significantly lower in the SGA babies (23.1 months versus 64.7 months).

The analysis also revealed that the longer a woman waited to get pregnant, the lower her chances of having an SGA baby.

Each additional month’s wait was associated with a 5% lower risk of having an SGA baby and a 4.2g increase in birth weight.

The optimal time to wait was found to be at least 24.5 months. Women with a BSCI of under 24.5 months were 15 times more likely to have an SGA baby than those who waited longer to conceive.

Finally, risk of having an SGA baby was similar for different types of bariatric surgery.

Dr. Araújo says: “Bariatric surgery-to-conception interval has a significant impact on birth weight, with shorter intervals associated with a higher risk of having a very underweight baby.

“This is likely due to the rapid weight loss that occurs after bariatric surgery making it difficult for the woman to gain adequate weight during pregnancy. The rapid weight loss can also lead to which may be harmful to the baby.

“A longer interval from surgery to conception allows the woman’s weight and nutritional status to stabilize.”

Dr. Carreira adds: “We recommend that women wait at least two years after bariatric surgery before trying to conceive, irrespective of the type of surgery.

“While it may be possible to slightly adjust this on an individual basis, it is important that women who are undergoing are aware of the risk of early conception and of the benefits of delaying pregnancy.”

Weight-loss surgery lowers many pregnancy complications, raises others

Provided by
European Association for the Study of Obesity

Women advised to wait at least two years after weight loss surgery before trying for a baby (2022, May 7)
retrieved 8 May 2022

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