No idea but it's a real baby and starving. It needs food now. Either powdered fry food or boiled egg yolk.
EMERGENCY FRY FOOD
Some fry like labyrinth fry (Bettas & Gouramis) and Iriatherina werneri are very small when they first hatch and need green water or infusoria. If you can't get these you can hard boil an egg. Remove the shell and white part. Push the yellow yolk through a handkerchief into a small container of dechlorinated water. Put the lid on the container and shake it up, then use an eye dropper to suck some of the egg yolk solution out and put it in the tank with the babies. Do this 3-5 times per day for the first 2 weeks then start adding newly hatched brineshrimp.
Boil another egg each day and make a new solution each day. Keep the solution in the fridge when not using it. Take the solution out of the fridge and let it warm up to room temperature for 10 minutes or so before using it in the fry tank.
Do regular partial water changes on the fry tank or have a small air operated sponge filter in it to keep the water clean. The egg yolk can cause ammonia levels to go up and without water changes or a filter the fry will die from polluted water.