I just did that this semester myself. My husband is also in school, and my daughter is challenging. I took 14 credit hours of science classes. If my husband were not in school at the same time things would not have been as difficult, but in the end I got all A's and one B! Now this semester my husband is going for his Master's and I am toning it down to half time. Once my husband is done with his schooling I will go back to take a full load. It is much easier to do it faster though harder, in my opinion. I am assuming you are caring for the child during the day and going to school at night. I am also assuming you are able to take the weekends to do your homework while your child spends time with your partner/grandparents? If you are able to have devoted study time i think you should take more than one class. It is challenging in the beginning , but stay organized and you will be great! good luck!
O and I was SO SO nervous when i first went back! I would have mini panic attacks but then one day I noticed as I was driving to school that I felt fine! and you feel old going back but you wont be the oldest!