minties
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I thought this might be helpful - it seems the "Windows of achievement for six gross motor milestones" are quite large according to the WHO, with crawling happening anywhere from 5 months to 14 months.
https://www.who.int/childgrowth/standards/mm_windows_graph.pdf?ua=1
https://www.who.int/childgrowth/mgrs/en/fnb_motor_37_45.pdf?ua=1
https://www.who.int/childgrowth/standards/mm_windows_graph.pdf?ua=1
https://www.who.int/childgrowth/mgrs/en/fnb_motor_37_45.pdf?ua=1