OK as someone who manages on significantly less albeit with some tc and wtc added in - despite having a great salary before child and for a short time after. I was made redundant when she was about 4 and hubby was setting his own business up, so we plummeted from a nice steady 45K to nothing, literally
Get money smart - check out the Money saving and get out of debt websites and forums, get out of debt - means saving in your case and prevent debt so all still valid in terms of saving money
Take a good hard look at what bills you have - how could you change those? e.g. our electric is high as no gas we made sure we had aaa rated appliances where ever we could when they needed replacing, we think about how we cook and eat in terms of what food we get in and how we plan to reduce waste both in terms of energy and the food itself. Before we got chickens we grew food like salad etc - hard work but if you like it try it.
When you budget don't forget stuff like hair cuts, new shoes, clothes allow a little each month but realise you may not spend it that month but e.g. wait for sales
Costs will fall ie no coffees, lunches, tea fund, work clothes, work travel, contributions to presents at work, charity donations for work and so on. Do allow yourself a play fund for baby classes, coffees out and so on.
I think its really important that Hubby is on board as well so the sacrifices shouldn't all be yours, yes there is shared mat/pat leave which will be especially critical if you are the higher earner, but also think about him buying lunch everyday, maybe reduce it to 3 days a week and 2 days sandwiches or other style lunch that he takes in. Reducing the cost of transport again shld be both, as should what is spent on clothes etc. This should all be about joint monies too - it becomes very unequal when you view his and hers money and one partner is not earning a salary as they are looking after a child - that partner is enabling the other partner to earn by looking after child - so allowances must be made for them to have some wriggle money - ie something they can buy a coffee from or pay for a book or paper or anything really