Sorry but I think you may be being a tad. unrealistic. I built up a fantastic career before I had my dc, worked really hard, got promoted and finally started earning a decent wage. All this changed when I had my first dd. There was no way I could carry on as before ie working late, going out with clients in the evening, travelling for work and so on. DD was in nursery so as a result picked up everything going which meant I had to take time off and so became unreliable. Managers started to view me differently and I missed out on lots of opportunities. I clung on at work to have my second child, and returned to work when she was 6 months old (as I did with my first dd).
Having 2 dd's meant it was doubly hard as I now had to combine a stressful job with nursery pick ups and school pick ups. Plus 2 lots of children;s illnesses to content with and take time off with.
However, on reflection things may be different for you, having really good childcare helps. I had to rely on nurseries but often dreamt about having a nanny or my mum looking after the children. If I'd had childcare which meant I could stay late at work, travel for work I may have been able to salvage my career. What sort of childcare do you have in place? You may also have a dh that can help out more, mine wasn't able to, he also worked long hours and couldnt take time off work.
For me it was almost a relief to be made redundant as I could no longer manage work and 2 small children. But again for me this was may more difficult because I had a long commute into work everyday which didn't help logistically with childcare etc. You may have a local job, work from home?
I'm currently looking for a new job which works in terms of childcare.
Good luck on your return to work 