FOREIGN women gave birth to a quarter of all babies born in England and Wales in 2012, contributing to a baby boom not seen in 40 years.
Figures released by the Office for National Statistics also showed the number of children born outside of marriage or civil partnership on course to reach 50 per cent within three years.
The report revealed that 25.9 per cent of births involved mothers born outside of the UK – an increase of 14.6 per cent since 1971, and the average age to give birth is now 29.8 years, up from 29.7 years in 2011.
Sir Andrew Green of the Migration Watch think tank warned that immigration was pushing up population and stretching public services.
He said: “If anyone wonders why maternity wards are under such pressure, this is the answer. Just over two thirds of our population increase is a result of immigration.”