I haven't got time to look at this now, but certainly if he is listed as 3 months on the 1871 census he may well have been born in December 1870 (so maybe 3.5 months old for instance) and I see the birth reg you enquired about was in Q4 of that year.
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 Merry
"Something has been filled in that I didn't know was blank" Matthew Broderick WDYTYA? March 2010
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