I finished my post grad degree 2 years ago and really enjoyed the fact that most of my classes were small but in one of my last units one of the other students separated and ended up needing to bring her son (4) to a few classes. It was not cool, having small classes means you notice everything and a child is something you notice. It would not be fair to other students or lectures. A university is an adult learning environment and while many welcome kids on campus most don't allow them in class. Your so close to finishing I would say knock your studies off now. You might find that once you have your bub you wont want to go back.

All the best in making your decision.