Procedures
health behavior
Data collectors stationed at each health facility recruited the cohort participants, after which they collected data at each participant’s home or location of choice. The baseline survey included questions on socio-demographic factors, household characteristics, pregnancy history, maternal health behavior, and home-based record ownership and use. We suspended trial activities for four months due to COVID-19 lockdown restrictions in Angola, so we consequently extended the follow-up period from three months after delivery to six months postpartum and changed some outcome measures. We registered all changes in the trial registry prior to the end of data collection. We collected data regarding antenatal care attendance, maternal health behavior, pregnancy outcomes, infant feeding practices and infant and maternal health retrospectively from women during the follow-up survey. We double-entered the verbal responses obtained from mothers, with record entries from individual home-based records for antenatal care, delivery, and vaccination service use, when available. We collected the data digitally using interviewer-administered structured questionnaires delivered using the Open Data Kit (ODK) Collect application [