Post-industrial transformations have significantly reshaped how young children are cared for outside the family home. Among other factors, the labour market participation of young mothers and a concomitant wish for intensive mothering have led to more diversified childcare solutions for the under-threes. Collective childcare projects (CCPs) promote approaches that are based on a home-like care environment and are run by educators and parents who have usually not trained in formal institutions but who become professionals in informal communities. Applying a discursive approach, this article asks: what characterises professionalism in CCPs? What type of professionalisation is being pursued? We analyse the case of Barcelona, using 45 interviews with association representatives, policymakers, campaigners, educators and parents. Our findings show the important role played by communities of care in defining professionalism and in consolidating a counter-professionalisation ethos, while evidencing their reluctance to pursue formal professionalisation.