You didn't provide any dates or approximate dates for his birth so it's harder for anyone to help. Here is a record found using the search tool at: https://familysearch.org/ However this Victor was b. abt 1908 and his parents immigrated (to CAN in 1907???) so there might not be a birth record found, as they probably had no permanent address?
Canada Census, 1916 Saskatchewan, Canada
Citing this record see https://familysearch.org/pal:/MM9.1.1/KMP8-S59
self William Mattson M 39y Sweden
wife Gurtrude Mattson F 29y Norway
son Victor Mattson M 8y U S A
daughter Emma Mattson F 7y Sask
daughter Gina Mattson F 5y Sask
son Hermen L Mattson M 2y Sask
mother Mary Mattson F 76y Sweden
This is possibly? William in Minnesota with his mother, record indicates they immigrated to the US in 1896.
U S Census, 1900 ED 118 Rollis Township & Twps.157-158/Ranges39-40, Marshall, Minnesota
Citing this record see https://familysearch.org/pal:/MM9.1.1/M9S1-9PP
head William Mattson M 24 Feb 1876 Sweden immig 1896
sister Hulda M Mattson F 21 Sweden
mother Mary Mattson F 61 Dec 1839 Sweden
