According to Familysearch, the two children, Clement and Robert, were baptized at Barrow, Suffolk. Have you checked the Barrow marriage register? Parishes adjacent to Barrow? Have you checked the Bishop's Transcripts as well as the parish registers?
Another thought, if you are desperate. The Suffolk Protestation returns (1641/2) could, potentially, give you a view of the distribution of Salisburys in the county at that time. However, they are only intended to cover males over 18, so Clement, if he was baptized literally in 1625, could be excluded. This also depends on there being a decent number of extant returns for Suffolk, which I haven't checked.
If that fails, you could consider searching the collections for distressed Protestants in Ireland in 1642; in theory, there was a collection in every English parish.