"It's a boy."

Fallout report about the first H-Bomb explosion, the Ivy Mike test. It had a ten megaton yield,  700 times more powerful than the atomic bomb dropped in Hiroshima in 1945.

WT-615 -Fallout nature, distribution and intensity from the first H-bomb test (U,S. Defense Dept. 1952). 

https://archive.org/details/WT-615