Quoting May ♥:" No that is not true. In MOST cases a 14 year old CAN have a healthy, problem free pregnacy. Are you ... [snip!] ... MAIN concern would be if she was EMONTINALLY and MENTALLY able to carry a child. But physically? She will probably be fine."
Most girls that young go into preterm labor because their body isn't ready yet. She didn't make that up it's a fact. Their hormones and body are not stable yet. Their body doesn't know where to put nutrients into itself or the baby. Hips often haven't spread like they should yet and several other physical things.