A rise in stillbirths between April and June, at the peak of the coronavirus pandemic, has prompted a national review by a patient safety body in England.
During that period, there were 40 stillbirths after labour began, compared with 24 in the same period last year.
Pregnancy and childbirth experts say women may have delayed seeking care.
The HSIB told the Health Service Journal that it had seen approximately twice the number of intrapartum stillbirths compared to the same time last year.
In a survey of nearly half of maternity units, 86% said fewer heavily pregnant women than normal had come forward with emergency issues in April, during lockdown.
"This may have been due to confusion around whether these appointments are essential, fear of attending a hospital or not wanting to burden the NHS," Dr Morris said.
"We have consistently advised women who have concerns or worries about their or their baby's health - including the baby's movements - should seek medical advice from their midwife or hospital immediately."
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