ABSTRACT Organisational specialisation characterises present social work in Sweden as internationally. Specialisation is often expected to lead to higher professional expertise. This study provides an overview of the development of specialisation and workforce characteristics in child welfare based on survey data collected in 2003, 2014 and 2018. The aim was to describe the development of specialisation and discuss the conditions for professional expertise in child welfare work. The results indicate that child welfare work is increasingly work task specialised. Social workers reported performing fewer tasks in 2014 and 2018 compared to 2003. This could be understood mainly as a form of statutory specialisation, indicating a shift in the professional role. Also, with the tendency to divide the work into only one or two phases of the process, child welfare work today almost resembles work at an assembly line. Compared with 2003, the statutory child welfare social workers surveyed in 2014 and 2018 were also significantly younger and less experienced. Since decision-making in child protection is a highly complex and challenging task, a question is if the development may be a survival strategy of the organisations rather than an opportunity for developing expertise.