Sainsburys is a bit more expensive generally speaking not hugely so (it used to be) but yes still more expensive
Aldi and Lidl are the cheapest, Tesco and Asda in the middle
The other thing is that non food items tend to be more expensive in the supermarkets than they are in other shops. The supermarkets undercut other retailers on this when they 1st started selling them but then when they had pretty much put those other retailers out of business (the brands that were about then) they hiked the prices up
Wilko, home bargains, b&m and even semi Chem and similar are usually cheaper for non food items including food related items like foil. So it's good to shop around. Poundland and the other shops I mentioned are sometimes cheaper for food items too. Where I live there's also a green grocery stall near Tesco which is cheaper for basic fruit and veg like apples, carrots etc
I used to (health prevents just now) head into town on "shopping day" I knew the prices of these items in Tesco for comparison, and I'd start off in wilko etc and get what I needed and was available in those shops and then head to Tesco to complete my shop by getting the items that were cheaper there or that I'd been unable to get in the other shop
Always take a list!
Don't shop when hungry you buy up to 30% more than you do when you're not, depending which study you go by.
Are you buying items that your parents/grandparents would have considered "exotic/unusual" as these tend to be more expensive
Income wise how come you're getting no maternity payments of any kind are you sure you're not eligible? Are you claiming all you are eligible for AND associated help?
It's been a long time but when I had Dd there were milk tokens etc not sure what's available now
Have you and he sat and done an actual budget together? Do you know what your total household income is? What your other outgoings are?
Does he LET you know this stuff?
Must admit I'm getting a tad sceptical/annoyed by the number of threads posted by an op on a potentially controversial topic and then they never come back to the thread