The Department for Education does not hold the information requested in this format.
Information on the number of children looked after who are aged 12 years and over, and who are mothers, is published in table A5 of the statistical first release ‘Children looked after in England including adoption’ . This shows that at 31 March 2014, 40 looked after children aged 12 years and over placed in secure units, children’s homes and hostels were mothers.
However, it is possible that these children were not looked after when they had their child. Additionally, data are only collected on the age of the mother at the birth of the first child, so it is not possible to determine pregnancy rates.