My generation ship aliens: Plausible development?

Development

The females ovulate on average 5-15 eggs per cycle. Unfertilized eggs get reabsorbed and fertilized eggs start developing a shell. The shell takes 2 weeks to fully form. Once all the fertilized eggs have formed shells the female goes into a state very much like our labor except she is laying eggs, not giving birth to live young. Once the eggs are laid she puts them in her pouch to incubate for 2 months. Then after 2 months have passed, the eggs hatch and the baby aliens start drinking their mom's milk Their mom eats what is left of the eggs to recuperate. There can be up to 3 aliens in an egg while still being viable though this is rare.

My momma told me that if the aliens are the same size as humans or similar that their eggs would have to be as big as an ostrich egg.

Now that's big. But their pouch can accommodate. Their pouch is both secure and super elastic. And pouch skin shedding occurs separate from shedding the rest of the skin in fully grown aliens. Each time they shed skin from the pouch, it grows in actual size and is able to better hold the eggs.

Would each egg have to be as big as an ostrich egg when fully grown to keep proportions similar to human proportions(This is how come I thought an egg tract would not be enough)?

EDIT:

Here Is how my Momma came up with the ostrich egg size. She compared the alien egg to this:

A human baby in the womb, full term and the alien egg have the same size amniotic sac.

posted over 7 years ago

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