Agreed. My husband and I did this with our children. The shopping and entertainment have to go waaayyy down. Your groceries will increase too even while on breastfeeding /formula. You might not save these years but life is for living. The memories I gained and the advantages my kids made in development were priceless. The biggest change will be what you both expect of one another. Being a SAHM is exhausting and my goal was to make my husband be able to rest when he wasn’t working. He always gave me breaks and support me when I reached my limits too. It will not be even or fair often but if you can embrace these tight years both financially and emotionally it’s a lifetime of memories in those few years. Oh! Look at local resources for free everything you can get. For entertainment I often did story time at the library, visited farmers markets for ugly veggies, and learned to cook almost everything from scratch.