Just don't beat yourself up too much. It serves no purpose.
Now for more practical matters. Have you visited the websites of all the manufacturers that make the baby products you use? If you haven't do it. They can be a great source of coupons and samples. Also mambo sprouts offers coupon books for organics and Procter and gamble have a great website with coupons and samples. I have gotten coupons and samples for tide, prilosec, and I think it was luvs.
Don't forget if you shop a lot at Wal-Mart they always match prices if you have a circular to prove the price. Also your girls can help you with container gardening. A lot of produce can grow in a container. Also craigslist can be a great source for free diapers, baby formula, coupons, and even extra garden produce. Also talk to the manager of your local grocers produce department. You may be able to score less than perfect looking produce that you can use in baking or freeze for smoothies.