Procedure
RECRUITMENT
Ethical approval was granted by the University of Sheffield Research Ethics Committee. Following recruitment and informed written consent procedures, participants were randomised to one of two conditions (intervention vs. control). Intervention and control participants completed the same measures at the same timepoints. Participants completed baseline measures when their child was between 0 and 6 weeks old (T1). To monitor treatment fidelity, and gather preliminary data regarding any mechanisms of change, an additional battery of measures was administered 6 weeks post-baseline (T2). T2 measures comprised the EPDS, sling/pram/sling library use, stroking, and infant illness/discomfort. At 12 weeks post-baseline (T3), participants completed the same measures as at T1, excluding demographics or the ECR-12 (as adult attachment style is considered a relatively stable trait [