DD moved into her big girl bed a few months after turning 2. She just turned 4 and still uses it. I know she would be fine without it. Every time I check on her she is never even close to the rail. However, she wants it up still. I ask her every few months and she keeps saying she doesn't want me to get rid of it, so I am leaving it up and not pushing the issue.
DD~6 years old~born June 6, 2008 (1st grade) DS~4 years old~born November 6, 2010 (1st year of preschool)
DS just asked for his to be taken down recently--within the last few weeks. I wasn't sure that he was ready, as he still moves a ton at night, but he hasn't fallen out yet.
My girls moved to their twin beds on the floor at 18 months (DD#1) and 17 months (DD#2). I used the bedrail the whole time it was on the floor (until around 2 1/2) when we added the box spring and then kept it on for another 5 or so months so I am guessing that at around age 3 give or take. It really depends on your child - does your child move a lot at night, sleep really close to the age? If yes to either, I would keep it on longer.
We removed them somewhere 3-3.5 when DS said he was ok taking them off. He's fallen out of bed 3 or 4 times since we removed them but it hasn't been a big deal. He's cried a couple of times or just sat there yelling "mom, I fell out of bed". I go put him back in bed, pat his back a few times then say goodnight & he goes right back to sleep. We have carpet in his bedroom & I keep a king size pillow stuffed between his bed & the nightstand so he doesn't that. If it was a hard floor I'm sure I'd be more concerned.
We never used one. We switched DD to her low toddler bed around 2/2.5 and we couldn't find the matching rail we'd bought to go w/ the crib 2 years before (argh!) so I just rolled up some towels and stuck them under the fitted sheet and did that for about 2 weeks. She's never falled out of the bed or even come close. If she were in a big bed, higher up, I still probably wouldn't use them, but I'd roll the towles again just to remind her to feel for the edge.
Re: Bed Rail
DS~4 years old~born November 6, 2010 (1st year of preschool)
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Married: '06 - Mom of 3 boys: '08, '11 & '14