Between 2001 and 2013, Hong Kong regulations permitted pregnant women from mainland China to travel to Hong Kong to deliver their babies. In this article, based on 30 in‐depth interviews, I explore the transborder lives and identities of these mainland Chinese families who, motivated by cost considerations, citizenship and anticipated benefits for their children, chose to give birth to their babies in Hong Kong. In some cases, family networks providing flexible residential practices and family care, supported these transborder activities. However, the complexities of transborder life reveal the diverse ‘identifications’ within Hong Kong society and mainland families. Because neither administration totally accepts them, they are not full members of either society and so the identities they form are both plural and fragmented.