Husband wants baby #2

Okay so I currently have a 9 month old and my husband has been talking a lot about having another baby. I told him I’m not ready because our daughter is only 9 months and I want her out of diapers before we have another. But the. Main reason is because I’m kind of traumatized by my labor with my daughter. With her I almost had to have an emergency c section because of her heart rate. And it scared me so bad along with some other issues with her delivery. I don’t know how to tell him. Because I don’t know if he would understand. Just need to vent.