dun -- Just FYI and not really on topic, but... I've had three with infantile reproductive tracts (my best-in-the-west repro vet said their tracts were 1/5th the size of their contemporaries), I gave them some time, and one settled first service AI, second settled second service AI, and third settled early in the breeding season natural service and is currently bred back for her 2nd calf.
As to heifers that don't look normal externally; got one over here that looked like a freemartin heifer (vulva and teats), vet said she had both ovaries but only one uterine horn, we ran her with the bull and she had her first calf around April. She was palpated recently, vet stuck his arm in, got this puzzled look on his face and says, "how long has this cow been in the herd?" LOL.
If a blood test calls her a freemartin then she is one, but if I'm just going off external signs and internal palpation, as long as they've got the minimum required parts (cervix, one uterine horn, one ovary), I'm inclined to give them the same chance the rest of the heifers get. I've had pretty good luck so far.