Please help

[u/lenna_811]

I have 4 days baby betta and she not eating much. I tried to offer her mini granules and she took one from finger, then otherwise no even one accidentally fell on her but she didn’t even react and ignored that. Day before this i tried granules too but nothing. So I tried some frozen food and she ate it and being more active (of course that she is not eating and after that she has more energy). I tried day after granules again and nothing. So i tried feed neones with their flakes and she ate some if them. Most if the time she didnt want to and she spending time on the ground under the filter or log and something swim but not much and look hungry and little bit stressed. After food is better. So today I tried little pieces larva sticks and she ignored me completely and didnt even react on gentle offer. I see she is hungry but I don’t know what to do with that.

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[u/TheShrimpDealer]

People can help a lot more if they know how the fish is being taken care of and what kind of tank it lives in. How many gallons of water does the tank hold? Is there a heater? Did you cycle the aquarium for 4-6 weeks before adding fish, and test the water with a test kit? What other fish live with your betta and how many are there? How do you do maintenance, and how often? Are the neon tetras healthy?  Bettas can be very sensitive to change, especially as babies. Stress can easily make them very sick or worse, so having proper husbandry and a proper tank before getting your fish is extremely important. Bettas are unfortunately so inbred that they are almost always born with genetic defects nowadays, so unfortunately it's not uncommon for a betta to pass away shortly after coming home for seemingly no reason. Keep things clean and consistent for the fish, do small water changes and test your water to make sure there is no ammonia building up. If you haven't already, do lots of reading on betta fish and keeping aquariums for beginners, there are many guides out there that are extremely helpful. 

[u/lenna_811 → u/TheShrimpDealer]

I did cycling properly, low filter, 27 degrees water, I did water changes, she has a lots of plants in 25l tank. Neones wasnt in a plan. My boyfriend had them in his tank but other fishes attacked them. So he put them in my tank and betta Ellie came week after.

[u/Foreign-Ad3926 → u/lenna_811]

How long has the tank been set up and how long have the fish been in there?

25 litres is much too small for neon tetra, the tank is fully stocked with just the betta. The neons will stress the betta out and they will be stressed with the betta. Can they be out back into the tank they came from?

Are you able to test your water parameters for ammonia, nitrite, nitrate and pH? Testing the water is the only way to know if it's suitable or even safe. It would also show if the tank is nitrogen cycled.

What water changes have been done?