I would start off with one class (I know that financial aid requires two, so do that if you have to). But if you can afford it, just one. Toddlers need a lot of attention and soon your one year old will be walking, which means more supervision. And before you know it your kid will be in school when you will be freer.
Is your boyfriend supportive? Do you have other family members to help?
Are you working at all right now?
Would you take your classes online?
Your kid is little only once and you can take classes over a period of time. If the hurry is financial related to getting jobs, maybe try community college with a health-related 2 year degree or certificate- at least at first. CC’s tend to be understanding.
Smith College has the Ada Comstock program for non-traditional students. I think they accommodate moms. There is the UMass University without Walls. Other programs for adults. Other ideas?
Above all take care of yourself and don’t overdo. You are young and have the rest of your life. One of my kids just got her BA at 30.