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Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
Marsupials actually do have internal uterus's and the fetus's that are inside this womb leave the uterus 2 to 4 weeks into the pregnancy and , since they are undeveloped, must spend the next part of their fetus life in the pouch for safe developing. This LINK explains this in more detail. The pouches are there for a very good reason and they actually do have an internal womb where the fetus's will reside for a period of time.Does that make sense to you?
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