This brief presents information about children of EU nationals in the UK via the use of birth registration statistics from England and Wales, Northern Ireland, and Scotland. Children of EU nationals born in the UK have not featured extensively in debates surrounding the EU Referendum. Yet, their demographic significance has been growing over time. Not only have they gained importance, but the countries of origin of the parents have also changed, as have the rates of births to mixed parentage. In 2016, the share of births to at least one EU parent amounted to about 12% of all births in England and Wales, 13% in Northern Ireland, and 10% in Scotland. These shares have been increasing, especially since the mid-2000s. These increasing shares can be linked to the inclusion of, and increase in, births to nationals from ‘newer’ EU Member States, especially those from the 2004 Accession. This also comes against the reduction of the share of births to Irish nationals over time, especially in Scotland and England and Wales. This picture is slightly different in Northern Ireland. We also see this change in the main countries of birth of parents, where the share of births to mothers and fathers from 2004 Accession countries has increased. Many of these births come from instances where both parents were born in the same EU country. Yet, ‘mixed’ births, where parents are born in different countries, have also tended to increase over time. This is not only for births with one parent born in the UK and one born in a EU27 country, but also, to a certain extent, for births where both parents are born in an EU country. This is especially relevant for parents born in EU14 countries. With regard to their geographical distribution in the latest period, births to EU-born parents were mostly concentrated in the East, in and around London, and along the Northern Irish border with the Republic of Ireland. The latter picture, however, changes slightly if we discount Irish-born parents from the picture.