Leasing vs buying a car?

Jade • Mommy to Rylee 2-3-16. To be married 5-29-16
Which one is better? I know it's a silly question to put on a <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy app</a> but oh well. I'm a new mom and my car is pooping out on me. I'd rather just get a new car and make payments on it. But I would prefer the payments be on the lower side! How can I get the payments down a bit and which one would be better to do buy or lease? Thank you for your advice!