The boy has been sentenced to community service in a ruling welcomed by the Reinfeldt family lawyer Elisabeth Massi Fritz.
“The crime was serious and could have led to serious consequences for my client,” she told the Expressen daily.
Gustaf Reinfeldt was attacked when he left a private party in the Stureplan area of central Stockholm last November. The PM’s son was 18-years-old at the time.
His assailant admitted to Stockholm District Court that he had hit him in the head with a beer bottle although denied having kicked him.
According to Expressen, the teenager claimed that the attack was some form of “revenge” because two of his friends has previously been assaulted.
Reinfeldt junior fell to the ground and lost consciousness in the attack.
Gustaf Reinfeldt gained media attention in March after landing a part-time job at conservative think-tank Timbro. In February he took his political bow after being elected as chair of the Moderate Party youth league in Solna.
The PM’s son has previously featured in the media for inviting his friends in August 2011 to come and have a burger at his then employer, US chain McDonald’s.
In February 2009, he joined a Facebook group “Free The Pirate Bay”, taking a highly publicised stand in favour of the controversial founders of the popular file sharing site ahead of their trial for copyright violations.