So I've recently had a second child. For now, he's in a co-sleeper and my daughter (3,5 years old) is in a toddler bed (big cot with bars removed).
I'm considering buying a bunk bed for when I transition the baby into the bigger cot, as the two will be sharing a bedroom for a while.
Can a 4 year old sleep on the top bunk? Which age would be safe?
Or is age even a good criteria? What kind of behaviour means a child is "old enough" ?