Information on a Birth Registration usually includes:

Name of child
Date & place of birth
Sex of child
Father's name, occupation, age & birthplace
Mother's maiden name, age & birthplace
Parents' marriage date & place
Previous children (sometimes names & ages are listed, sometimes only the number of males/females is listed)
Informant - the accuracy of every registration depends on this person!
Persons present at the birth
Date & place of Registration

Information on a Baptism (All Pre-1856 and "Volume" Numbers after 1856) can include:

Name of child
Date of Baptism
Parish where baptised
Date of birth (mostly but not always)
Father's name
Mother's name (Church of England usually have married name; Catholic, Presbyterian & Wesleyan often have maiden name)
Residence (usually)
Occupation of father (sometimes)
Names of Sponsors (Most Catholic records)
Name of Minister (usually but not always)

Name of deceased
Date of Burial
Parish where buried
Date of death (sometimes)
Residence (usually)
Occupation (sometimes)
Name of ship (occasionally)
Name of Minister (usually but not always)

Name of Groom and Bride
Date of Marriage and Parish where married
How performed (whether by banns or license)
Religious affiliation (sometimes)
Witnesses to marriage
Residence of Groom and Bride (usually)
Occupation of Groom (occasionally)
Name of Minister