Stay at home moms

I have a question for all the stay at home mothers. How do you and your family make it work?! I have one son who is almost 4 and a baby due in September. I would love to be a stay at home mom but I don't know if my family would make it if I don't work. Are you super careful with the money that's spent or does your partner just make enough where your comfortable?? I'm totally fine working but I'd love to be able to spend more time with my babies!!