If you don't have an ancestry sub, familysearch have the films for Maisemore. You can view them at home for free as long as you're signed in.
The parish registers are still not digitised, but the BTs are.
Go to 'catalog', and put in the name Maisemore.
A search on the BTs film does indeed throw up some children for Thomas and Elizabeth.
Nothing that looks like it could be a mistranscription of 'Timothy', but you never know.
It could also be that the name 'Etheridge' has been mistranscribed.
It may also have been that he was never baptised for some reason, in which case you'd have to look for other ways to find him such as in my first post.
The film of the BTs may also have pages missing, or bits of pages torn, burnt, eaten by insects etc.
You could search each frame of the film to see if you could find him.
