Maybe not relevant when looking for a child's bed?
Some years ago friends and their 4 children used to come and stay with exdh and I.
Being a bit short on spare rooms, I bought an inflatable mattress to P & D to sleep on the floor of the sitting room.
On the first night, once all the children were in bed sleeping bags on the floor of DS's room, we decided after the last bottle of wine that it was bedtime for grownups too.
The bed was inflated, pillows, sheets and duvet all installed. We said our good nights set of for sleeping quarters. Husband D decided to go to the bathroom before turning in. Wife P was already ensconced in bed and reading a few pages of her book whilst waiting for her DH.
We heard him going down the stairs, then a brief period of silence. This was followed by a series of shrieks and then the sound of helpless laughter.
Wife P is 4ft 10", and a slight little thing, husband D was 6ft tall and solidly built. His getting onto/into the blow up mattress had shifted the air somewhat which resulted in P being catapulted up and out of the bed!