Final answer:
The number of Proctor's children baptized is not provided, but given Puritan customs and references from Arthur Miller's 'The Crucible,' it is likely that some of Proctor's children were baptized if he was a member of the church.
Step-by-step explanation:
The number of Proctor's children who are baptized is not explicitly stated in the provided texts. However, we can infer from the passage about the Puritans and their concerns over declension that the importance of baptism was significant in their society. This cultural context suggests that it would be likely that Proctor, being a character from that era (specifically in Arthur Miller's play 'The Crucible'), would have had his children baptized according to the Puritan customs of the time. To be precise, in 'The Crucible', it's mentioned that not all of Proctor's children are baptized; hence, the explicit number is not provided in the play itself.
Using the information from the last passage referencing the Puritans in New England, it is known that only children of full church members could be baptized and that there was a significant effort by the Massachusetts clergy to ensure that even children of partial members could be baptized through the Half-Way Covenant. Therefore, it is historically plausible that if Proctor was a member of the church, at least some of his children would have been baptized unless his family was part of the more orthodox Puritans who rejected the Half-Way Covenant.