Naŭmovič was born into a farming family in the village of Kašaliova in Navahrudak district, Second Polish Republic (nowadays – Belarus) on 3 October 1922.
Naŭmovič did not speak this language well, did not want to understand and accept the Soviet power, which was the reason of numerous conflicts during his studies.
The Gebit commissar (regional commander) had authorised to open a Belarusian school where Naŭmovič continued his education and which he graduated from in 1944.
Along with all other graduates he was issued a diploma featuring the swastika which would pose additional difficulties in higher education and employment afterwards.
During a Soviet bombardment of Vilna, Naŭmovič managed to escape from the division to a forest and fled to Besançon, France.
He illustrated several books written by Belarusian authors and published outside Belarus in 1950-1960, including “Spadčyna” (“My Heritage”) by Janka Kupala, “Symon-muzyka” (“Symon the Musician”) by Jakub Kolas, “Matčyn dar” (“A Mother's Gift”) by Aliés Harun, the journal “Lia čužych bierahoŭ” (“By Strange Shores”).