Every time we add a new one, I am afflicted for a while with a subliminal panic. It's the same feeling I remember from stepping up to speak in front of a big room jammed with people, or being handed a test on which the only English words are "translate" and "parse." If it could talk, it would say, "Oh no. I can't do this! HELP HELP HELP!"
How many babies do we have now? How can I possibly keep track of them all? HELP HELP HELP!
But the task is at hand. Start the speech; I know what I have to say. Answer the easiest question; then do the one before and the one after. Settle this one down, pull that one up, ask the next to bring me the book, start reading like nothing has changed. They'll never know. Ignore the panic as well as I can, and before long my part will be just like last time when the room was small and nearly empty, or when the questions were about the alphabet. But--if I nail it--there will be more laughter and clapping, and more satisfaction in a hard-earned good performance.
(And as we all know, the only way to nail it is to crash 9000 times during practice. :P )