It’s hard to sex at that age but you can give it a go.
Press your finger down the vent area just in front of the anus. the area will protrude. A doe will display a slit. Each side of the slit will be pink. Whereas A buck, will display, if less than 5 weeks old, a blunt white tube without a line in the center. It will not have pink traversing either side of a center line.