Hello Wozzle,
Again, thanks for the look-ups.
I confirm that the baptism you found for Phoebe is correct. I think there is a mistranscription in the 1841 and "house keeper" should have read "horse keeper". Is it possible you have not been able to find the baptism records for Phoebe's siblings because the family moved between 1841 and 1842 and may have been out of the St John's Hackney parish? The next child I have on my tree is Phoebe's sister, Mary Ann born c1844. Information taken from the 1861 census.
Have a nice evening. Regards, Rose