The Royal Council of Midwifery said the "NHS continues to fail too many women," who are not able to see the same midwife during and after their pregnancy.
A survey by the health regulator, the CQC, found only 28% of women can rely on the care of the same midwife over the course of their pregnancy.
It is sad to see that in three years the NHS has not improved in terms of women seeing the same midwife during their care, which often means women have to repeat their histories over and over again.
Ms Warwick said this is due to the shortage of qualified midwives.
"The RCM’s latest estimate is that the NHS in England is short of 4,800 midwives, so it is sadly inevitable that women will see many different midwives," she said.
More top news
The incident is not believed to be terror-related, British Transport Police said.
The royal couple have been in the US to mark the 300th anniversary of the foundings of New Orleans and San Antonio.
A small number of people were treated at Southgate Tube station, British Transport Police said.