Baby formula contains iron content which helps babies grow and if you drink too much of the baby formula as an adult then you could get too much iron which could be bad for your health.
But aside from that you could technically drink some baby formula and it wouldn't hurt you.
But once you take a taste of baby formula as an adult you would not want to drink it because it's nasty.
I tasted some of my babies formula before just for the heck of it and it's gross and made my stomach hurt and I threw up.
Maybe that's why babies throw up after being formula fed because that baby formula is gross and not tasty at all so I would not think any adult would like to drink it.