Search strategy Ovid – Medline and Embase 1. breastfeeding.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 2. breast feeding.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 3. exp breast feeding/ 4. breast.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 5. feeding.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 6. 4 and 5 7. human milk.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 8. breast milk.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 9. exclusive breastfeeding.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 10. exclusive breast feeding.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 11. 1 or 2 or 3 or 6 or 7 or 8 or 9 or 10 12. assessment.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 13. scale.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 14. evaluation.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 15. measure.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 16. instrument.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 17. tool.mp. [mp=abstract, title, original title, broad terms, heading words, identifiers, cabicodes] 18. 12 or 13 or 14 or 15 or 16 or 17 19. exp animals/ not humans/ 20. 11 and 18 21. 20 not 19 22. limit to English language We performed two separate searches 1. Ovid interface - Medline database Version “Ovid MEDLINE (R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE (R) 1946 to Present” 2. Ovid interface - Embase database Version “embase 1980 to 2018 week 21” Meeting 3 July 2019 – short