Hi Kris,
You need the parish and Östergötland is both a county and a province. I think this person found on the 1890 Swedish Census CD is yours, but you'll need to check the parish records to be sure.
father:
Post 842921
Johansson, Nils Johan
Jordbruksarb.(farm worker)
f.(born) 1837 i (in) Västerlösa (Östergötlands län (county), Östergötland)
Gift (Married) man, far i familjen (father in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county), Östergötland)
Födelseort i källan (birthplace in the source): Vesterlösa, Ögt. l. (Östergötland län (county))
mother:
Post 842922
Nilsdotter, Karolina
f. (born) 1848 i (in) Västerlösa (Östergötlands län (county), Östergötland)
h.(wife)
Gift kvinna (married woman), mor i familjen (mother in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county), Östergötland)
Födelseort i källan (birthplace in the source): Vesterlösa, Ögt. l. (Östergötland län (county))
children:
Post 842923
Albertina Kristina
f. (born) 1875 i (in) Slaka (Östergötlands län (county), Östergötland)
d.(daughter)
Ogift kvinna (unmarried woman), barn i familjen (child in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county), Östergötland)
Födelseort i källan (birthplace in the source): Slaka, Ögt. l. (Östergötland län (county))
Post 842924
Elin Maria
f.(born) 1875 i (in) Slaka (Östergötlands län (county), Östergötland)
d.(daughter)
Ogift kvinna (unmarried woman), barn i familjen (child in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county)Östergötland)
Födelseort i källan (Slaka, Ögt. l. (Östergötland län (county))
Post 842930
Karl Johan
f. (born)1877 i (in)Vreta Kloster (Östergötlands län (county), Östergötland)
s.(son)
Pojke (boy), barn i familjen (child in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county), Östergötland)
Födelseort i källan (birthplace in the source)
: Wreta Klosters
Post 842928
Emil Emanuel
f. (born)1879 i (in)Vreta Kloster (Östergötlands län (county), Östergötland)
s.(son)
Pojke (boy), barn i familjen (child in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county), Östergötland)
Födelseort i källan (birthplace in the source): Wreta Klosters
Post 842926
Signe Alfrida
f. (born) 1882 i (in)Vreta Kloster (Östergötlands län (county), Östergötland)
d.(daughter)
Flicka (girl), barn i familjen (child in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county), Östergötland)
Födelseort i källan (birthplace in the source): Wreta Klosters
Post 842931
Nils Enock
f.(born)1884 i (in)Vreta Kloster (Östergötlands län (county), Östergötland)
s. (son)
Pojke (boy), barn i familjen (child in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county), Östergötland)
Födelseort i källan (birthplace in the source)
: Wreta Klosters
Post 842925
Hilma Karolina
f. (born)1886 i (in)Vreta Kloster (Östergötlands län (county), Östergötland)
d.(daughter)
Flicka (girl), barn i familjen (child in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county), Östergötland)
Födelseort i källan (birthplace in the source)
: Wreta Klosters
Post 842929
Erik Rickard
f.(born)1888 i (in)Vreta Kloster (Östergötlands län (county), Östergötland)
s.(son)
Pojke (boy), barn i familjen (child in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county), Östergötland)
Födelseort i källan (birthplace in the source)
: Wreta Klosters
Post 842927
Axel Gunnar
f. (born)1890 i (in)Vreta Kloster (Östergötlands län (county), Östergötland)
s.(son)
Pojke (boy), barn i familjen (child in the family)
I Socknen (in the parish)
Vreta Kloster (Östergötlands län (county), Östergötland)
Födelseort i källan (birthplace in the source)
: Wreta Klosters
I Socknen may mean they didn't have a fixed address in the parish or at least, it wasn't included in the record. Hopefully the Swedes will explain further.
There were no birth certificates. You just will get a copy of the page in the parish birth book. That should be available on microfilm Look in the Family History Library Catalog under Östergötland and select Civil Registrations and then utdrag ur ministerialböcker, Födde (for births) and then the correct year. You will need to go through all the parishes to find the right one.Order from a Family History Center.
It would be quicker to use the fee-based Genline site.
http://www.genline.com Look under the county (Östergötland) and then select scb instead of the name of the parish.
Judy