How can an egg form a fully formed animal outside the womb but we can’t do the same with a premature human infant?

Question

How can an egg form a fully formed animal outside the womb but we can’t do the same with a premature human infant?

In: 5

Answer 1

Evolution over millions of years has enabled some types of creatures to do this, e.g. birds and reptiles, mammals have not, they went down a different evolutionary track. However, we are getting closer to enabling this with artificial wombs such as in this report https://www.bbc.com/news/av/health-50056405