www.familysearch.orgbaptism records
Mary Ann Sudlow 28th dec 1828 at Manchester Cathedral - James and Margaret parents
Ann 1st February 1830 same parents / cathedral
Elizabeth 27th july 1831 - James and Margaret - same Cathedral
Thomas Coop Sudlow 1st October 1834 same parents / cathedral ...presumably died as an infant
William 20th april 1836 same parents /cathedral
Thomas 7th feb 1838 same parents / cathedral
so - was Mary Ann working away from home at age 12 during 1841 census or has she sadly passed away ...second baby is also named Ann so possibly Mary Ann died young as well.
I couldn't find the baptism of Harriet - but they have her marriage
Harriet Sudlow
England, Manchester, Parish Registers
Name Charles Henry Dixon
Event Type Marriage
Event Date 27 May 1855
Event Place St Mary's Parsonage, Manchester, Lancashire, England
Gender Male
Age 22
Marital Status Single
Birth Year (Estimated) 1833
Father's Name John Dixon
Spouse's Name Harriet Sudlow
Spouse's Gender Female
Spouse's Age 22
Spouse's Marital Status Single
Spouse's Birth Year (Estimated) 1833
Spouse's Father's Name James Sudlow