There are too many variables to be able to give a definitive answer.
Childcare - depends on how many days, what type, where you live, what help you can get, whether you use childcare vouchers. I don't know about benefits for childcare. Near us a FT nursery place is about £10k per year.
Running costs of a baby - food is anywhere from free (BF) to formula (perhaps a tin a week at £12, though I might be out of touch) to readymade formula at about £35 a week. Obviously they eventually eat food which costs something. Nappies - perhaps £10 a week for pampers, less for own brand, washing and drying costs plus initial outlay for cloth.
Clothes - anywhere from virtually nothing if you know someone with a child who wants to get rid of them, through to stupidly expensive.
Toys & books - use a library and what you are given or spend loads.
Furniture - buy it new and premium brands could cost lots. Otherwise get second hand or Ikea stuff for perhaps £200 or less. You do need a new cot mattress. Free cycle can be good for furniture.
Travel stuff - new car seat £100. Potentially need a base too. Travel system - new perhaps £400-600 with everything and new, much cheaper second hand.
Probably the most expensive time is maternity leave due to the loss of income (unless you have a great scheme at work.
I was always told by my mum that if you wait until you can really afford children, you'd never have them.
We're having DC2 and I have my fingers crossed that someone I know will be counting the pennies and want all of our baby stuff once we're done with it as it takes up loads of space.
Good luck with your IVF.