ah we decided to use washable nappies, we've saved a fortune with those, and ds was breast fed, so never had to buy formula either.
Washables cost us about £100, and washable wipes too (Ikea face cloths cut into 4) ds is now 15 months!
As to fruit and veg, depends on what you call expensive. A banana costs us about 10p, and an apple is about 10p too. Tinned fruit, pineapple chunks in juice for 27p.
Veg, we just bought a pack of 5 leeks for 17p!
Peppers 6 in a bag for 90p.
So if you look around it doesn't need to cost a fortune. When you compare the cost of a piece of fruit to say a bag of crisps or a bar of chocolate they start to look pretty cheap.
I should also add that for our supermarket shopping we only have one choice, that is Morrisons, and that is a 40 mile drive away (80 mile round trip) including a short ferry trip. For local purchases we have one shop, the next nearest is 20 miles away!
So compared to most folks we pay well over the odds for everything. We use very little frozen veg, generally find that a weeks worth of veg will stay plenty fresh enough in the fridge. It is however important to make sure that what you buy is used. Throwing away fresh fruit and veg is the biggest waste of money there is.
The great secret is pre planning, and flexibility. Plan menus, and be prepared to change if there is a seriously good deal available when you go shopping. Also if you can buy staples in bulk.
I guess we eat a main meal involving meat or fish 4 days out of 7. Costs for meaty meals are not really any more expensive than non meaty. Unless you feel the need to eat a steak and chips type of meal. (And I don't intend any criticism by any of the above )