http://www.theguardian.com/news/data...e-times-census
The numbers originate from a 2011 census release first published by the Office for National Statistics in May 2013 and in more detail in November as a specially commissioned ad hoc table.
The figures do not calculate birthrate as such, but show that almost a tenth of babies and toddlers (under-fives) in England and Wales are Muslim. Of 3.5 million children up to the age of four in England and Wales recorded in the 2011 census, 317,952 (or 9.1%) were Muslim.