ID	Search	Items found
#18	Search (#17) AND (“1990”[Date ‐ Publication] : “3000”[Date ‐ Publication])	8,789
#17	Search #15 NOT #16	9,807
#16	Search Editorial[ptyp] OR Letter[ptyp] OR Case Reports[ptyp] OR Clinical Conference[ptyp] OR Comment[sb] OR “pubmed books”[Filter]	3,377,353
#15	Search #13 NOT #14	10,636
#14	Search ”Animals”[Mesh] NOT (“Humans”[Mesh] AND “Animals”[Mesh])	4,499,401
#13	Search #8 AND #10 AND #11 AND #12	11,246
#12	Search “Infant Nutritional Physiological Phenomena”[Mesh:NoExp] OR “Infant Food”[Mesh:NoExp] OR “Weaning”[Mesh] OR wean*[tiab] OR diet[tiab] OR nutrition*[tiab] OR food*[tiab] OR feeding[tiab] OR beikost[tiab] OR “partial breastfeeding”[tiab] OR “partial breastfeeding”[tiab] OR “non‐exclusive breastfeeding”[tiab] OR “non‐exclusive breastfeeding”[tiab] OR “mixed breastfeeding”[tiab] OR “mixed breastfeeding”[tiab] OR fruit*[tiab] OR vegetable*[tiab] OR cereal*[tiab] OR wheat[tiab] OR gluten[tiab] OR egg*[tiab] OR peanut*[tiab] OR fish[tiab] OR shellfish[tiab] OR porridge[tiab] OR rice [tiab] OR meat[tiab] OR bread[tiab] OR juice[tiab] OR corn[tiab] OR puree*[tiab] OR IYCF[tiab] OR solid*[tiab] OR “spoon‐fed”[tiab] OR “spoonfed”[tiab] OR meal*[tiab]	1,721,416
#11	Search time[tiab] OR timing[tiab] OR moment[tiab] OR duration[tiab] OR age[tiab] OR month[tiab] OR months[tiab] OR early[tiab] OR week[tiab] OR weeks[tiab] OR year[tiab] OR years[tiab] OR day[tiab] OR days[tiab]	8,740,036
#10	Search introduction[tiab] OR introduce*[tiab] OR introducing[tiab] OR start*[tiab] OR beginning[tiab] OR milestone*[tiab]	1,296,548
#8	Search ”Infant”[mh:noexp] OR “Child, Preschool”[Mesh] OR infan*[tiab] OR young child*[tiab] OR baby[tiab] OR babies[tiab] OR early childhood[tiab] OR weanling*[tiab] OR “ first year of life”[tiab] OR “early life”[tiab] OR ((“pre school”[tiab] OR preschool[tiab] OR kindergar*[tiab]) AND (child*[tiab])) OR “preschool aged”[tiab] OR “preschool age”[tiab] OR “pre school age”[tiab] OR “pre school aged”[tiab] OR “kindergarten age”[tiab] OR “kindergarten aged”[tiab]	1,461,295