J.B.
6 is the minimum age and that's the age we waited for.
What's the safety bar like? One of my younger brothers slipped between the mattress and the bar when he was little - I think he was 4 at the time. His chin got caught on the bottom of the bar and he was hanging off the bed. My mom is a light sleeper and heard him struggling so she was able to save him but otherwise, he would have hanged to death. My mom pushed for a recall of this so I think the bars have changed so that there is not space between the bar and the mattress but be very careful. Freak accidents happen.