First is definitely a male. The males don't have bright pink bellies, and their dorsal fin is much more pointed, and is longer in that pointed area.
The second does look like a female...has the pink tummy...and the tail doesn't look as long. Females have a more rounded tip on their tail and thus not quite as long.
She looks like she's showing off to start breeding. If you have any other fish in the tank, you may want to remove them. Sometimes kribs breed quietly, other times (like with my male) they kill every other fish in the tank.
In fact, my male has killed two female kribs now
Once the fry are free swiming, move them. Kribs often cull the fry and you'll be left with none. I like to just siphon them out with a gravel vac hose and put them in a grow out tank.
And lastly, I like the Tetra mini-granuals for cichlids for feeding the fry, as they are small bites to start with, and crush easily with finger tips.