Alison's attention perked up when Dr. Crusher said she'd found something interesting. It didn't sound like a bad kind of interesting thing, so she didn't worry. Mostly, she was just curious.

And then when she heard what was so interesting, it took a minute for the information to sink into the right places. Most importantly, that the doctor was speaking about 'single births' as if that was no longer what they were dealing with...

"Mine is... Wait. So, you're saying... there's more than one baby?"

201 was a big number. She was a little concerned about just how many more babies they were discussing.