Hey,
Why not give it a go, You'll never know if you don't try.
As far as child care, everyone is eligible for 50% Child care rebate and then depending on your income you might get some more help so it should be financially viable, especially if it were only a couple of days a week

I find my days with my babies are so much more enjoyable because of my days away. Not to say I don't feel like crying when I leave them but I think its a great life and I would definitely advise you to try it out
If after a month or two it feels wrong you could stop, but don't make rash decisions in the first couple of weeks, give it a real chance.
I also like knowing that I can get that haircut or top without worry
Good luck with your decision