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I had the same issue in the past to resolve my issue i followed bellow instructions
Please use geom_bar() instead of geom_histogram, Also please refer sample code given bellow it provides separate graph for each month for birth date data:
ggplot(data = pf,aes(x=dob_day))+
scale_x_discrete(breaks = 1:31)+
facet_wrap(~dob_month,ncol = 3)