Table 1.

Keywords searched.

Prenatal care	Prenatal* OR antenatal* OR pregnan*
Low SEP	Poor OR poverty OR “low income” OR socioeconomic OR socio-economic OR depriv* OR disadvantag* OR marginali?e* OR vulnerabl* OR “low education” OR “low prestige” OR “social class” OR “social classes” OR disparit* OR inequalit* OR discriminat* OR inequit* OR indigent OR impoverish*
OECD countries	Australia OR Austria OR Belgium OR Canada OR Chile OR Czech Republic OR Denmark OR Estonia OR Finland OR France OR Germany OR Greece OR Hungary OR Iceland OR Ireland OR Israel OR Italy OR Japan OR “Korea Republic” OR Luxembourg OR Mexico OR Netherlands OR “New Zealand” OR Norway OR Poland OR Portugal OR “Slovak Republic” OR Slovenia OR Spain OR Sweden OR Switzerland OR Turkey OR “United Kingdom” OR UK OR England OR Scotland OR Wales OR “United States” OR US OR USA (manually searched)
Infant birth outcomes	“Preterm birth” OR “preterm births” OR “pre-term birth” OR “pre-term births” OR prematur* OR “small for gestational age” OR “small-for-gestational-age” OR apgar OR “birth weight” OR “birth weights” OR birthweight* “intrauterine growth restriction” OR “intrauterine growth retardation” OR “neonatal intensive care” OR NICU OR “infant outcome” OR “infant outcomes” OR “birth outcome” OR “birth outcomes”
Midwifery-led care	midwif* OR midwives OR nurse-midwif* OR nurse-midwives
Physician-led care	physician* OR obstetrician* OR doctor* OR “family practitioner” OR “family practitioners” OR “shared care” OR “medical led” OR “medical-led” OR “medical managed” OR “medical-managed” OR “medical model” OR “medical models” OR “usual care” OR “standard care”