Which infantry?
None in the US Armed Forces.
Israel tried it and it didn’t work out.
The Russians brag about their WWII females, but none of them served as actual infantry, which requires much more than shooting a rifle.
In training. They interviewed a woman captain who had destroyed her pelvis (angle of the femur)from marching with gear.
The whole issue regarding women on the frontlines is that some feminists think it’s unfair that so many men are generals. It’s an asset to have combat experience, hence the push to put women on the frontlines.