Hi Josey, No I haven't found a baptism. I suspect if baptised it would have been in the Free Kirk.
The parents were married 18th August, 1914. I haven't been able to find a marriage certificate yet but I know he was married on 29th October, 1939.
So, yes I know that they married in August, 1914.....at present I guessing that the son William was born 14th December, 1914 - 4 months later. It may be that a family member has changed the date on the birth extract - maybe to make it look like he was born a legitimate or maybe to make him look younger to avoid war or whatever!?!?!?