Hello,
I would need you to answer a few questions:
-What filter do you have?
-What are the baby fish and how many do you have?
-What's you're tap water parameters(Ammonia, Nitrite and Nitrate)?
-What test kit are you using and when did you get it?
Is this well water? If so, what is the kH and gH of the water, and do you treat the water, and with water conditionner(Prime, Nutrafin tap water conditionner, Stress Coat, ...)?
You're are probably ''over stocked'' by a bit, but what's suprising is that you have that much nitrite. You're fish will likely die in no time in those parameters. It's just way too toxic for them. The Nitrate levels are also beyond ''toxic may I say. A cycled tank should show no traces of ammonia and nitrite, or lower then 1 PPM. Ideally, Nitrates should be under 20 ppm. The filtration can also have a big impact on this. Keep feeding them every other day as starving them isn't the best option. I'll be able to help you further once you answer my questions.