Sleep Problems: Preschooler, Munchkin

Need Advice on Spacing Between Kids

I am looking for a bit of advice on spacing my kids out. I have a 5 month old and my husband and I have been talking on getting pregnant again. I hear that having your kids close together is great for the kids. However, I'm not sure if we should wait until my little munchkin is a bit older. I'd love your advice!