Sometimes a general Internet search can teach you about geography - I've gotten info even from Wikipedia about Norwegian parishes/provinces/cities/etc.
It appears that the daughter Ragnhild was also born in Lesja, Oppland, Norway.https://familysearch.org/pal:/MM9.1.1/VWGC-S5X
That extracted record does not indicate whether the child's parents were married.
The 1801 Norwegian census shows Peder still living with his parents and unmarried.http://digitalarkivet.uib.no/cgi-win/webcens.exe?slag=visbas...
The Norwegian church records for Lesja (and Dovre) are online as scanned images and absolutely free for your use. You'll have to learn how to use them to be able to search for marriages, births/baptisms, deaths, etc.
The Digitalarkivet web site has been adding scanned images of the original Norwegian parish church records for anyone with Internet access since November 2005.
The Digitalarkivet web site - http://digitalarkivet.uib.no/cgi-win/WebFront.exe?slag=vis&a...
An English option is available by clicking on that word from either the left hand column or the blue link bar along the bottom of the homepage.
The scanned images are available from the homepage link "Skanna kyrkjebøker" [Norwegian version]/"Digitised parish records" [English version] which is listed along the left hand column and from the blue banner of links along the top section of the homepage.
Clicking on "Skanna kyrkjebøker" [Norwegian version]/"Digitised parish records" [English version] will bring up another screen and listing to choose from. Choose "Lesa skanna kyrkjebøker" [Norwegian version]/"Read the digitised parish records" [English version].
After you've clicked on that link and a new main page has presented on the screen be sure and read the instructions that are available from the Digitalarkivet for navigating the scanned records. The instructions are available in Bokmål (official Norwegian), Nyorsk (Norwegian), Davvisámegiella (Saami), and English.
Recommended basic reading are the "Startsiden" [Norwegian version]/"Main page" [English version], "Brukerveiledning" [Norwegian version]/"User's guide" [English version] and "Om tjenesten" [Norwegian version]/"About this service" [English version].
Good information about translating the formats of Norwegian parish church records during various time periods, many of the basic terms used and understanding how to use the information should be studied at this web site -http://homepages.rootsweb.com/~norway/na20.html
There is a message board specifically for Oppland -- look in the folder called Counties when you open the Norway message boards.