Lexie is jazzed to be on the pediatric rotation for the day. Alex warns that things can be rough in the nursery. Intern Morgan's baby is a prime example of this. The premature infant came into the world weighing less than a pound. The baby's dad, Chris, is a surgical resident at another hospital. He knows the chances for survival are slim. Lexie doesn't buy it. She thinks this kid will fight like a champ. That's probably why Alex nicknames him Ali.
Chris doesn't want to do any aggressive procedures to save his child. After a little push from Lexie, Alex lets Morgan know that her baby has plenty of doctors in his corner. What he needs is a parent. That's why Morgan lets Chris know that she's giving him an out as far as caring for little Ali. Actually, Morgan says she wants to name her son Thomas. That'll work. Alex says Tommy is a good, tough name.
Extremely difficult times are ahead for Morgan and her baby. This has Lexie wondering if perhaps she was better off sticking with Derek and his "lost causes" cases. Then Alex shows her a board filled with pictures of all the premature babies who battled to become great kids leading healthy lives. This gives Lexie and hope and makes Arizona smile.