I noticed Andrew Pollock posted the following here. As a fellow parent, I can tell you not to worry too much about the fact at 12 months your child might not be walking. All you can do is talk to the medical people and ensure nothing is wrong. At the end of the day it will just happen.
My son Darwyn, didn’t walk until he was 21 months. It was only after we had him to a specialist to do a final check, and from that visit/appointment onwards after walking back and forth a few times he never stopped.
Prior to that visit, he would do the usual hold something and walk around, and even walk between 2 people if prompted. But I guess he just wasn’t ready.
Of course, we now can’t get him to stop. Not that I am complaining.