I understand your concern erica.
Strangely there are only the following baptisms on Lancs OPC for children of Benjamin and Ann. Looks like a batch of years are missing - but location is Ashton under Lyne;
Baptism: 29 May 1722 St Michael and All Angels, Ashton under Lyne, Lancashire
James Harrop - Son of Benjn. Harrop & Anne, his w.
Abode: Platts
Occupation: yeoman
Baptised By: Curt.
Register: Baptisms 1721 - 1728, Entry 10
Source: Original Register
Baptism: 11 Jun 1727 St Michael and All Angels, Ashton under Lyne, Lancashire
Matthew Harrop - son of Benjamin Harrop & Ann, his wife
Abode: Flats
Occupation: Agricola
Register: Baptisms 1721 - 1728, Entry 7
Source: Original Register