The court heard two of the men, ages 25 and 27, broke into the southern Stockholm apartment in January while a 22-year-old man stood watch outside, The Local reported Thursday.
The men, whose names were not released, were seen fleeing when police arrived and they were soon arrested.
Police said the thieves had pocketed $401 in cash as well as jewelry, mp3 players and a baby's umbilical cord.
"We had saved our newborn baby's umbilical cord as a memory, kind of like how some people keep a lock of their children's hair. It's a tradition in some countries," the child's father told the Mitt I Soderort newspaper.
The 25-year-old man and 27-year-old man were convicted of aggravated robbery while the 22-year-old was convicted of aiding and abetting. The older men were each sentenced to nine months imprisonment and the younger man received a suspended sentence.