As to the baptism record of 12th Feb, it's almost certain that applies to the same birth as 2nd Feb.
Assuming this is the child who grew up to be Thomas Graham, ...
It implies that Louisa Ann Harris that we found from Glamorgan, Wales, may not be the Louisa Harris who was presumably married to Alfred Harris, the French Polisher and that we should search out marriages between any Louisa - surname unknown - and Alfred Harris of an appropriate age.
The Welsh connection was inferred from finding Louisa Ann Harris born in Wales but I would point out that I don't remember any mention of Thomas's mother being Welsh. The Welsh thing may be a rabbit hole. The only reliable documentation we have - Grandad's birth and death certificates - just say Louisa Graham (Nee Harris) (deceased) - I think the "Ann" was a mistake on our part from thinking that Louisa Ann Harris born in Wales was the same person as Louisa Harris. I suspect we inferred that she was not already married from the combination of youth - and getting made pregnant by the head of the household where she was in service. So next little adventure would be to identify the maiden name of Louisa Harris.
Note that if she was indeed dead at the time my Grandparents got married, my Gran could only have met her during her engagement, and it does seem plausible that would be when she would want to meet her prospective mother-in-law. Who, if she was indeed deceased by the date of the marriage certificate in 1920, would likely have died between 1918 and 1920, given that it's likely my grandparents met after his return from the war/de-mob from the army in 1918 or 1919?