Having kids close to the same age

So I’ve been thinking, i’m pregnant now with my son, and I would like to have another baby close to this one so their back to back. How do I do that? If i’m EBF and I don’t have a period for let’s say a whole year, do I not ovulate? Would I have to stop BF with my son early and give him formula (which that’s fine, nothing wrong with that...) so I can get my cycles back on track? how do you have kids close in age back to back? I’m Genuinely curious. Thank you for all the answers!