Most of the issues you bring up have been on my mind perpetually since my DS was born, a little over 2 years ago. I still struggle with them, but here are some things that have helped.
Child care exchange. I teamed up with another artist mama who had a child close to DS's age. She takes both kids one morning a week while I work, and and I take both kids one morning while she works. It is a nice arrangement. It doesn't cost any money. I am comfortable with my friend looking after DS. I know and trust her. DS has gotten to know my friend's child, and now the two toddlers are quite close. A hard part of this approach is finding another artist mama whose schedule and children's ages match yours. But it may be do-able.
I also got a babysitter for two mornings a month. I don't think this is detrimental to my DS's secure attachment. The babysitter started when DS was about 1 year old. We eased into it, and DS took it in stride. It is nice to have that guaranteed time reserved for my art. Of course, this costs money. I found it to be worth the price, and I've been frugal elsewhere in order to afford the babysitter.
That is how I've adressed the practical time concerns. As for marshalling my own inner resources, that has also been a challence. I sometimes feel too tired or harried or scattered to do my best work (or any work) when I have the time. I just decided to plunge in. I try to accept lousy work and half-assed work as what I'll do while I'm finding my way back into my best work.
My work has also changed in ways I never anticipated. My being a mother "shows up" in my work now. It was a nice surprise!
Well, gotta go. Gotta get to work