While the hippo was born a month ago, the zoo only made the announcement on Wednesday.
"Olivia is a well-behaved little thing and has fattened up nicely since she was born," Jennie Westander of Parken Zoo in Eskilstuna said in a statement.
Olivia joins her parents Krakunia and Anton, who also have a son called Oliver.
With her rolls of baby fat, the zoo has compared her to a "mini Michelin man".
The pygmy hippopotamus (Choeropsis liberiensis) is an endangered species native to western Africa. There are 126 in zoos around Europe, and they can grow to weigh up to 275 kilogrammes.