User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5460283-20130102043847/@comment-4212769-20130103185731

First off, Kanguroos are no reference for underwater creatures. The baby born very early needs to climb into the pouch to come to the teats of the mother. It's very tiny and more or less still an embryo.

Problem 1: There is no reason for it to climb into a pouch or something that holds it as Ceadeus is a reptil and doesn't give milk. Problem 2: Reptiles don't have gills but lungs. The child would simply drown if it would be born this way. Problem 3: The beard more or less is a huge problem. How should a small animal get through that pelt and find a pouch? Problem 4: How should the female Ceadeus lay an egg into the pouch?

Sea horses are no reference either as they have gills. Also the pouch is freely available and not covered by thick hair-like structures.

Again it's a reptile. And reptiles have lungs and cannot suddenly detach them and evolve gills again.

And as you didn't get the thing with the pressure I will again explain it:

Smaller eggs are very stable as they are compact and don't get that much pressure. They have less hollow space in it that the pressure could press in as there is nearly no place for such hollows. So they can survive.

Bigger eggs on the other side are unstable as they aren't as compact and get much pressure as pressure increases with the area. There is more place for hollow spaces that could eventually lead to the contusion of the egg. Impossible to survive.