Fifteen per cent of British babies are now born to parents who are neither cohabiting nor married. Little is known about non-residential fatherhood that commences with the birth of a child. Here, we use the Millennium Cohort Study to examine a number of aspects of this form of fatherhood. Firstly, we consider the extent to which these fathers were involved with or acknowledged their child at the time of the birth. Secondly, we identify characteristics that differentiate parents who continue to live apart from those who move in together. Thirdly, for the fathers who moved in with the mother and their child, we enquire whether they differ in the extent of their engagement in family life compared with fathers who have been living with the mother since birth. Finally, for fathers who were living apart from their child when the child was nine months old, we assess the extent to which they were in contact, contributed to their maintenance and were involved in their child's life at this time.