I don't think it's wrong for you to want to stay home. I stayed home after my husband and my second child was born. Here is some information for you that might help you get your husband on your side. Did you know that a family of 4 that earns less than 2000 dollars a month can get food stamps. I don't know if this is true in all cases but my case worker told me that if you have 2 children under the age of 5 welfare doesn't require that you look for a job while receiving food stamp benefits. Plus I read that if you earn under 30,000 a year you can get WIC as well. They give you over a hundred dollars worth of formula a month.
Bring these things up to your husband along with what you'll be saving in childcare and maybe he might change his mind. Hopefully the information I've given you can help.