The perception from mothers that their baby is moving less commonly can occur when a baby has changed position or the mother hasn’t noticed the movement because she is busy or distracted.
However in some cases, reduced movement could be a sign that the baby is unwell, which can be worrying for pregnant women and midwives.
Professor Heazell said: “We know that a reduction in baby’s movements is a common reason to attend maternity services. Thankfully, in the majority of cases the baby is ok.
“The findings of this study will help us to reassure the majority of mothers that their baby is healthy, and help us to focus intervention for the babies who will benefit from being born because they are not receiving enough oxygen or nutrients in the womb.”
Sanne Gordijn said: “We call the ratio between the two ultrasound measurements the Cerebro Placental Ratio (CPR). The idea is that an abnormal value may indicate that the placenta is not functioning properly.
“In that case, it is better for the baby to be born in the short term. We do this by inducing labour. If the value is normal, it would be better to wait for the natural moment of delivery, as the baby may not be completely ready yet. Women who want to give birth at home can still do so.”
“The results of this study show better outcomes for the baby when the result of the CPR measurement is known.
“This means that we see fewer complications during childbirth when this measurement is taken, compared to the current policy where it is not done.”
She added: “If doctors know the results of this measurement, they can better distinguish whether the baby’s reduced movement has a harmless cause or whether it requires action.
“This ensures that mother and baby receive the care that best suits their situation.’ The guideline on reduced fetal movements will soon be updated; the professional association will incorporate the results of this study into it.”
The study was funded by ZonMw from the Netherlands.
Sanne Gordijn conducted this CEPRA study together with researchers from Amsterdam UMC in 23 hospitals. Laura Lens, the MD, PhD student on this study presented at the international SMFM conference in Denver (USA) and Sanne in London. The study is published on July 10 in the authoritative scientific journal The Lancet Obstetrics, Gynaecology & Women’s Health.
- The study is published in the Lancet Obstetrics, Gynaecology and Women’s Health and is available here
- doi.org/10.1016/j.lanogw.2025.100002
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