Temps are too low. Babies need 80 degree temps 24-7 especially when the soil is as moist as yours. Could also be low grade mix you are using. Do you have a fan circulating air making the leaves twitch a bit? Are your lights intense enough? Keep practicing. It doesn't look good for the baby SORRY. If I had it with me I could save it if it was really a life or death situation but it would take me 3 weeks of 24 hour T-5 therapy after replanting it in my own mix. Just start all over and learn from your mistakes.