Quote:
Originally Posted by BR
At what age should they get their first feeding and how often thereafter should they be fertilized?
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Depends.
(LOL, "depends" seems to be my go to word for the day) 
Seriously, many factors involved. Some will say they don't fertilize seedlings at all. Others will disagree.
I fertilize.
Some seed starting mixes have added nutrients, others don't.
I use the compressed bales of Pro-Mix, which really doesn't have much in the way of added ferts. My first necessary watering after seeds germinate is when I first fertilize. 1/3 to 1/2 strength seaweed emulsion.
Then I fertilize again after potting up to 4 inch pots. For that, I usually use something with lowish nitrogen and a high middle # (phosphorus) at 1/4 to 1/3 strength.