intestines and even the lining of their heart. today, however, they're each tipping the scales at 11 pounds. >> i walk in every day and i just -- i can't -- i can't get over, you know, how blessed i am that they're so healthy, so rambunctious and a miracle. >> the twins still need help breathing. they can raise their head up and sit on their own. doctors at texas children's hospital preparing to separate them by the end of the year. a remarkable story of how this mom found out they were conjoined. they were having an ultrasound. the ultrasound technician left out of the room after seeing the picture. and came back with a doctor. doctor looked and said, here's one head, here's the other head. the mom was just stunned. can you imagine? >> i can't even imagine. but it was really hopeful and wonderful. they said they can tell the difference in personality. one is always bright-eyed and awake, seems to be a little more talkative, making noises. the other one is quiet,