As has been said above, it used to be the case that a couple could raise an action at the Sheriff Court to re-register an illegitimate birth of a child after the parents married. To my knowledge this was still going on up towards the end of the 20th Century but pretty rare.
I actually read the date as 1932 at first glance which would make the child c.21 years and, therefor, possibly about to get married themselves?