Hi Juju,
sorry, edited my post below:
To sum up, so far we found 2 likely candidates for birth reg for Ann 'nurse child' born Minshull Vernon living in 1871 with the Hulmes in Middlewich, either Ann Chesters Sep qu 1868 or Annie Jane Chesters Sep Qu 1869.
The one you've found can be ruled out I think as she was with her own family in 1871 census, and she would be the 1868 reg, so I've been looking for another Ann in 1871 to fit the 1869 reg. and haven't found one. Hopefully that means that that 1869 birth reg. could well be for the Ann born in Minshull Vernon.
I'll leave it to tofgem now to mull over what's been found and decide whether to order the cert...

Barbara