I was one of your first replies, this thread has certainly gained some momentum!
A few things:
-You still haven't answered if anyone is around on Saturday morning to look after your child?
If they are, and you can drop an hour in the morning and at night at work, and find a good nursery you MIGHT be able to make this work.
-Why can't your husband help in the morning? Do you both need to be at work at 6:30am.... Is this breakfast service in a restaurant, or what?
If you are managers it does seem like you could pick shorter shifts for yourselves
- You say that if you want to get promoted you have to put the hours in or someone else without children will fill your shoes.
Sorry, but that's the path you've chosen. You can still keep working and have a career but your child should come first and promotions second. That's life as a parent.
I speak from knowledge . I'm a scientist, I got pregnant with my daughter whilst doing a first year PhD course. It was bad timing, but I had to suck it up and consider what was best. I took the Mphil (masters) and left it there and that was hard enough to complete. I decided I wanted to be with my daughter and bond with her rather than zooming off to work every day and staying there til late. I still have a career but I didn't push everything to the limit.
You might one day come to similar conclusions.
I wish you good luck x