Looks like we were blessed with babies in the same month!
With both our kids, I got AF back after one year.
In both cases, they never had anything but breastmilk.
Our first child breastfed on demand but did start to sleep through the night after a few months.
We TTC when AF came back and I got pregnant when our eldest was 18 months old.
I BFed through the pregnancy with our second and until the second was seven months old, when our first stopped BFing in a truly child-led manner. Didn't ask for it for one day, then another day, a third and a fourth, and didn't say anything about it. Even after that point, our toddler didn't mention it.
Our second, a week or two younger than yours, is BF on demand, but does not sleep through the night. We BF two or three times during the night.