How tall are everyone’s 9 month olds?

Cait • Fri, Apr 27

My son is 29”. We were told by his doctors that because of his condition, he’d likely be on the shorter side. This app says that he’s 88th percentile for his age. Are they maybe using older height charts?? Where does everyone else’s baby fall on the height percentile? Just curious 🤷🏻‍♀️