« Reply #19 on: Tuesday 19 February 19 14:45 GMT (UK) »
When I was young in 1940s I was told that we had to take special care of baby boys as they tended to fall seriously ill and die.
A couple of decades ago when I started researching my father's family, this seemed to have a grain of truth in it when I discovered one of his direct paternal ancestors had had baptised three babies "John", two babies "Robert" and two babies "William. None of the baby girls had been "replaced"
There was some research published ln 2017 on immunity:-
" Genetic differences between the sexes mean newborn baby girls are less likely to fall ill with acute infections than newborn boys, a new study by researchers here has found. ... Girls have two copies of the X chromosome, while boys only have one and it is this chromosome that has more of the genes involved in immunity."
Aberdeen: Findlay-Shirras,McCarthy: MidLothian: Mason,Telford,Darling,Cruikshanks,Bennett,Sime, Bell: Lanarks:Crum, Brown, MacKenzie,Cameron, Glen, Millar; Ross: Urray:Mackenzie: Moray: Findlay; Marshall/Marischell: Perthshire: Brown Ferguson: Wales: McCarthy, Thomas: England: Almond, Askin, Dodson, Well(es). Harrison, Maw, McCarthy, Munford, Pye, Shearing, Smith, Smythe, Speight, Strike, Wallis/Wallace, Ward, Wells;Germany: Flamme,Ehlers, Bielstein, Germer, Mohlm, Reupke