I need a car. What am I supposed to do?

Me & My husband have bad credit & no one will finance us. We are working on our credit but that will take a few months & we have a baby coming in May & we need a car before then. We are just like a million other people & cant just go pay cash for a car so we have to finance it. We are looking at cars in the 12k-15k range & have about $5000 to put down. Neither one of us have a co-signer that we could use. We understand that we will have a payment & high interest rate & we are ok with that because we will refinance after a few years. Any tips or advice would be greatly appreciated. We are desperate! Thanks!