This episode was really Phoebe's episode. The triplets were born and she had to say goodbye to them in a very touching scene. Lisa Kudrow did a wonderful job in this episode, probably her best performance thoughout the show.
However this episode falls on the fact that the plotline makes no sense. Triplets aren't delivered in the "traditional" way out of fear that one or more of the babies will not survive. And even when twins are born they monitor the babies carefully to make sure they are alright. Yet Phoebe has a normal delivery without any constant monitoring. I know it's a sitcom and that they can stretch things a little, but it just feels pretentious to have a whole big episode about something which isn't real. For me it made it harder to relate to the storyline.