Id be worried about it. What if in the middle of the night and they wake up, not knowing where they are, half asleep and try to climb out, especially if they have to go to the bathroom. Id hate for an injury to spoil your trip! They say kids under 6 (I believe) shouldnt sleep in a bunk bed because of falls. Ive never seen the berths as we get a balcony room with a pull out sofa. Last year for our ~2 yr old I got a Bob the Builder inflatable sleeping bag and he slept on the floor without any problems. We just stood the sleeping bad against the wall during the day. Of course we had room to do this, and I dont know if you would with 2 kids in a smaller cabin.
The ones we had didn't have a railing. I wouldn't do it with children that young.
Celebrity Century 1/09
Carnival Destiny 10/07
Carnival Destiny 9/06
Monarch of the Seas 3/06
Carnival Inspiration 8/05
Carnival Miracle 4/05
Carnival Inspiration 4/04
Sovereign of the Seas 4/03
We just had upper and lowers in our cabin and there were railings on the top bed. Still wouldn't put a little one in them (under say 4-5) but there were railings. We had an 8 year old with us and I slept in the top berth just to be on the safe side and it was quite comfortable. Closer to the AC and I like it cold in the room so it was perfect for me.
I don't know if you can do this on that ship, but on a Carnival ship we were on, our cabin steward helped us take the mattress off the bunk and we put it on the floor, used up floor space but at least we didn't worry about our son falling out of bed at night!
As I've posted earlier, our children have been cruising with us since they were each 14 months old. We've had them in upper berths since they were about 3 and there has never been a problem. We would point out the beds to them, before tucking them in, and have them sit up there for awhile before turning out the lights. That way they got used to it. Also, we always asked for extra pillows and put them around each child on an upper berth. Extra padding made us feel better and the children were quite comfy. And yes, there are railings on all upper berths (all we've seen). Boy Voyage.
When my daughter was young and already had many cruises under her belt yet, she would still fall out of the cruise beds many times. (She never did this at home.) I think it's because the beds seem narrower than standard twin beds at home. Thus, my vote goes to having mom and dad sleep on the upper berth until your child is older.
Luisa Frey Gaynor
Family Cruise Editor