I just took a quick look through all of the indexed census records for Thomas Baldwins born around the correct time in Kent and there doesn't appear to be another one who was born anywhere near Beckenham or West Wickham. It's possible that John and Avis Baldwin's son Thomas died or changed his name before 1841, otherwise their son could very well be your ancestor. If you don't have your Thomas' marriage record, perhaps you should purchase it. Sometimes the father's name is included....sometimes not!
Linda