Table 2.

Participant timeline

Timepoint	Study period
	Enrolment of participants	Allocation of clusters	Postallocation
	B	0	F1	F2	F3
Enrolment
Eligibility screen	X
Informed consent	X
Allocation		X
Interventions (for those in intervention communes)
Learning clubs
Assessments:
Mother
Maternal common mental disorders	X		X	X	X
Maternal serum ferritin	X		X
Maternal haemoglobin level	X		X
Maternal urinary iodine concentration	X		X
Quality of parent-parent relationship	X		X	X	X
Mother’s reproductive history	X
Sociodemographic characteristics	X
Child
Bayley Scales of Infant and Toddler Development					X
Infant anthropometric indices				X	X
Home environment for infant development				X	X
Infant haemoglobin level				X	X
Infant microbiome				X	X
Infant birth weight and gestational age at birth			X

B: Baseline; F1: Late pregnancy (32 weeks of gestation); F2: when infant is 1 year old; F3: when toddler is 2 years old.