Dozens lit up candles in Yerevan's Liberty square on 19 January in memory of Seryozha Avetisian.
The 6-month-old Armenian infant died in hospital on Monday one week after the six other members of his family were murdered in their home in Gyumri.
The baby boy, Seryozha Avetisian, survived his 2-year-old sister, parents, aunt and grandparents by only 7 days.
Seryozha had been in critical condition since being found stabbed in the chest on January 12 several hours after the massacre thought to have been carried out by a Russian soldier serving in Armenia’s second largest city. He underwent surgery in a Gyumri hospital before being transported to Yerevan’s Surp Astvatsamayr hospital the next day.