Process variables
The process evaluation questionnaire at T1 (parents in the intervention group only) includes questions concerning frequency, duration, content of and satisfaction with the infant massage intervention. The semi-structured logbooks the intervening professionals (nurses) complete after each intervention session, consist of pre-structured registration booklets. Amongst other things, the nurses are asked to indicate to what extent the goals of the session have been achieved, if they deviated from the standard procedure and if so, why and in what way, and whether the contact and cooperation with the parents was pleasant. Finally, interviews are conducted with five to ten parents who participated in the intervention and 4–6 professionals, focused on their experiences with the intervention, recommendations, and preconditions for (further) implementation.