My daughter was 14 months and she wanted her “big girl bed” and had no problems getting out and playing at night or through naps

My 18mo is in a twin and her older sister was in a full at this age so I say no. I put just the beds ontop of the box springs on the floor so they can easily get in and out on their own and they have bed rails.

I just keep thinking he will fall or get up and play with toys. We have a monitor but I just worry too much I guess

My son wasn’t ready 🤦‍♀️ and probably want be anytime soon

I don't think it's too young. All my kids were in toddler beds by 16 months. First few days is rough but then they got the hang of staying in bed. But I agree with the poster above, depends what kind of sleepers they are. I got lucky and all three of my kids were great sleepers from day one so the transition was easy for them!