3 inches is too small for a female that is around one year old. Pacman females are always larger in size so I assume two things happened....either he is a male that has not called yet( yet by this age, males normally grow a little "airsack/beard" under their chin that is easily visible and have nuptial pads on their thumbs) or your female could be stunted. Have you been dusting Ca/D3 & multivitamin supplements throughout the first year?