Table 1.

Keywords for each search term

SPIDER reference	Search terms
Sample	Obes* OR body mass index OR bmi OR body mass index 30 OR bmi 30 OR overweight
Phenomenon of interest	Breastfee* OR breast fe* OR lactat* or infant feeding
Design	Questionnaire* OR survey* OR interview* OR focus group* OR case stud* OR observ*
Evaluation	View* OR experience* OR opinion* OR attitude* OR perce* OR belie* OR feel* OR know* OR understand*
Research type	Qualitative OR mixed method*

Note. * represents truncation. Combined [S AND P of I] AND [(D or E) AND R].