I'm actually asking this for a friend of mine, who's son is 18 months old. They just moved to a smaller house, and now her 2 boys ages 3 1/2 and 18 months have to share a room. She bought bunk beds to save room, and she has the crib for the baby in the lower part of the bunk beds. Though it's a great idea, it is a little bit cumbersome for her and so she's wondering if it's too soon to think about getting her younger son into a toddler bed. He's a big boy, about 30 pounds and 35 inches tall. He's a good sleeper in the crib and puts himself to sleep. I told her I'd post this question to get an idea of what ages babies have gone into big beds. So as many responses as possible would be great. Usually here in the US the ages have been around 2 years old, but I'd be curious if it's different in the UK.