You can lookup the danish churchbook for Vester Ulslev sogn and find that there was a boy born 8 sept 1849 and he was christened in Vester Ulslev Church 21 october 1849. His parents were Mads Clausen and Anne Jørgensdatter.
His name was Christen Madsen or Christian Madsen.
The danish census are online and you can find a family in year 1850 living in Vester Ulslev village in a house.
They were: Mads Clausen, 34 years old Ane Jørgensdatter , 39 Claus Madsen, 8 Kirsten Madsdatter, 7 Christen Madsen, 5
The age of the youngest son I suspect is wrong in the census.
I think there are several match with your info, but if it is the right person you must decide.
You can lookup in the danish sources that are online.
You are welcome to visit my website with links to the danish sources: