I started studying again when she was 4 months (not going back to work but you know, it's something). And I went to work 20-25hrs a week when we was 16 months, and full time (40 hours a week) when she was 18 months.

It is hard, but it'll be hard no matter how old they are. I find that working makes me appreciate my time more though, I get a lot more done in a lot less time now than I ever did as a full-time SAHM.