I may be shot down in flames, but the most important years of a child's life should be spent with his mother, nurturing him full time.
Rather than force him through his most formative years of life being without his mother, have you not thought an OU course would be more appropriate in your circumstances? Or even waiting until he is school age before thinking of yourself?
After all, it was your choice to have him and your choice to want full time university.
Where is his choice?
Being an adult with the responsibility of caring for a very young child, means making sacrifices.
For what it's worth, I think your priorities should be for him and any compromises you make should be your own, not his.