There is on the 1851 census at Breams Eaves

Unbistiset? BROWN - daughter - 1 week, born West Dean

GlosBMD gives:

Birth Details

Child Surname Child Forename Father Surname Mother Surname Mother's Former Name Year District Office Register Entry
BROWN Female -- BROWN -- 1851 Forest of Dean Monmouth, Coleford 7 333

(ie no entry for Father Surname OR Mother's Former Name)

FreeBMD gives only these two "Brown, female" entries in all 1851 Glos BMDs, namely:

Surname Given Name District Volume Page Transcribers
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Births Mar 1851
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Brown Female Monmouth XXVI 89 Higgy
Brown Female Monmouth XXVI 89 KeithSayers

and sadly, presume same child:

Surname Given Name Age District Volume Page Transcribers
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Deaths Mar 1851
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BROWN Female Monmouth XXVI 52 phijost
BROWN Female Monmouth XXVI 52 1hartley