I work at a university and we don't allow mothers to bring their babies or children into lectures or tutorials. It disadvantages the other students in the class. However, many subjects will have lecture materials available online even if you are not officially an external student. So you *may* (depending on the university / course) be able to do your study from home anyway. Lecturers *sometimes* have consultation times available where you can knock on their door and ask questions. You *may* be able to do this with the baby. It all depends on the individual university and lecturer. You need to make sure you get a lecturer who is flexible for you.

Have you considered doing just a single subject at an external university and trasferring the credit over? I did my whole degree by correspondence, and they mailed me all the lecture notes for the entire subject at the beginning of the semester along with all of the assessement items. I could get as far ahead as I needed to and studied when I wanted. It worked well for me.

Good luck getting this all sorted out. Remember though that it may not be possible to fall pregnant the exact month you want to, for some perfectly healthy couples it takes up to 12 months.

Edit: Are there any practicals / computer laboratories etc involved in this course? What about group projects? That would complicate things further. Do you have someone to look after the baby when you need to do in-class exams?