I've gone back to work part time since having my daughter and she goes to nursery three days a week.
I could have gone back full time, but I didn't want to. I could work longer hours on the days I'm in the office, but I don't want to. My husband could (and would) finish on the dot of 5pm once or twice a week to pick her up, so that its not just my career that's taking a battering, but I don't want him to. I want to do it. I miss her. I don't want to not see her before she goes to her bed at night. She is my priority now. I'm not saying my way is necessarily the right way, everyone is different, but I have found that since having my daughter, my views towards work have completely and utterly changed. I'm glad I have my job (sometimes...) but it's just not the be all and end all.
When my daughter goes to school, then I'll go back full time, pick up the reins again and make a success of my career. My mum did exactly this, and now has a highly successful career aged 55. Same with my mother in law. I see them as having "had it all", more or less. Or as close as I've seen it anyway. Excellent relationships with kids they enjoyed because they were around in the early years (I'm not trying to say that you need to not work to have a good relationship btw, I'm not trying to offend or judge anyone, I swear), and successful careers later on once the children have become a bit more independent. I'm probably being naive though. And I do appreciate that there are various reasons that it doesn't work that way for everyone.
Very few people wish that they had spent more time in the office when they are lying on their death bed. I worked for a man who didn't see his young children from bedtime on Sunday night to the following Saturday morning, every week, because he put work first and worked late every single night. They barely know who he is. They have a rubbish relationship, they won't even be left with him! I just can't get excited about having a high flying career after witnessing that.