Has that umbilical chord a normal size?

[Lord Sorril]

The second one that yesterday came out of the egg have past away last night. It’s sad! He has 50 gram. I wonder why. Yesterday evening I get him out of the incubator, washed the vermiculite off, and put him in his Box. Today morning he’s dead. The first one looks very strong, she has 60 gram.

I have not seen any of my hatchlings die so soon after successfully hatching. You say 'he' and 'she'. By chance did you pop these snakes? If so...could be the source of the issue.

How long do you let them in the Incubator after they hatched?

Depending on how many hatch: I will grab them at any time in the process from newly hatched to left in the incubator for a week. If I see a yolk sack stuck to the snake I will definitely leave it in until it falls off...

oh btw the Incubator is a self made one. A styrobox with an Aquarium Heater in water. The Humidity must be very high, cause non of them eggs dinkle . They look very round til the end. Maybe is this why there is too much Liquid in the egg for this stage?

Is your incubator using a proportional thermostat or an on/off one? I have found aquarium heaters to be inaccurate with balancing temps--I would not try to incubate using this method without a proportional thermostat and a highly insulated container in an area with perfectly stable temps.

Also, the developing hatchling will absorb fluid as it grows. Having an egg at the end stage with a lot of fluid suggests it may have had trouble growing.