You can do it!
I went back to school when my son was a few months old. I started with one class, then two, and built up to full time. I went when my husband was home with our son (when I first went back, he was able to go in later so I could take early classes). It's a lot to balance the home, kid, school, marriage, but it CAN be done. I'm graduating in May with my BSN (and my son is now 5), and it's been a wild ride! The great thing is that my son LOVES hearing about my school stuff, and probably knows more about fetal development than most adults!
We held off on more kids until after nursing school
, but finances were REALLY tight for us, since my husband lost his job along the way (not exactly responsible to have more kids under those circumstances).
There are people in my program with very young kids (one guy had a 5 week old when we started), so yes, it can be done, but it's definitely challenging.