Gender: boy
I found two matches for J. Judkiewicz born between the years 1921 and 1927.
The frist name I found was Jehuda Judkiewicz born 27 May 1925 and lived at Hohens 48 flat 9 and Przelenta 16 and he died on 5.8.42.
The second name I found was Josef Judiewicz born 1927 and he lived at Hoehns 15 flat 24 and Narutowicza 31 and was deported but doesnt give a date.