tight fitting please go 0.5 size up
https://www.dhgate.com/product/children-gilrs-students-short-sleeve-fruit/570805092.html
Male US4=Female US5 =UK3 1/2=FR36=JP220=CHN220
Male US4 1/2=Female US5 1/2=UK4=FR36 2/3=JP225=CHN225
Male US5=Female US6 =UK4 1/2=FR37 1/3=JP230=CHN230
Male US5 1/2=Female US6 1/2=UK5=FR38=JP235=CHN235
Male US6=Female US7 =UK5 1/2=FR38 2/3=JP240=CHN235
Male US6 1/2=Female US7 1/2=UK6=FR39 1/3=JP245=CHN240
Male US7=UK6 1/2=FR40=JP250=CHN245
Male US7 1/2=UK7=FR40 2/3=JP255=CHN250
Male US8=UK7 1/2=FR41 1/3=JP260=CHN255
Male US8 1/2=UK8=FR42=JP265=CHN260
Male US9=UK8 1/2=FR42 2/3=JP270=CHN265
Male US9 1/2=UK9=FR43 1/3=JP275=CHN265
Male US10=UK9 1/2=FR44=JP280=CHN270
Male US10 1/2=UK10=FR44 2/3=JP285=CHN275
Male US11=UK10 1/2=FR45 1/3=JP290=CHN280
Male US11 1/2=UK11=FR46=JP295=CHN285
Male US12 1/2=UK12=FR47 1/3=JP305=CHN295
Male US13=UK12 1/2=FR48=JP310=CHN300