"the smallest one has a long way to go. She will be having a cat scan in the morning. She may not be as old as the other two. Developmentally, either she is way behind or she was fertilized at a later time. On a rare occasion, a woman's body decides to release an egg a month after the previously fertilized egg or in this case, eggs  are imbedded in the uterus. That is what I think has happened here. If that is the case, then the brain may not be very mature and she will need to have specialized care. We need to know as soon as possible if that is the case." Dr Andrews spoke to Dan.