From what I see, this baby isn't a newly hatchling. His eggtooth has fallen off and his yok sac has absorbed. The opening of the sac is gone as well.
Try live prey to entice him to eat such as worms, crickets, pellets soaked in tuna juice, as well as veggies such as water fern, water hyacinth, frogbit, anacharis, redleaf lettuce, carrots
He's very cute
