There's plenty i don't know....but i'm learning every day. Have a look on some of the forums such as http://www.uk-aquarist.com/index.php?&act=idx ....lots of people 10 times more knowledgeable then me.
Yes....depending on what species of fish the babies are....some babies get sucked into the filter intake. I had a thriving community of baby guppies in the bottom of my external canister filter once !!!!