What's that mean? Gas and air?
It is basically 50% Nitrous Oxide (laughing gas) and 50% air (oxygen, nitrogen, carbon dioxide etc)
Gas and air (Entonox) Gas and air won't remove all the pain but it can help to reduce it and make it more bearable. Many women like it because it's easy to use and they control it themselves.
How it works
You breathe in the gas and air through a mask or mouthpiece, which you hold yourself. The gas takes about 15 to 20 seconds to work, so you breathe it in just as a contraction begins. It works best if you take slow, deep breaths.
There are no harmful side effects for you or the baby but it can make you feel light-headed. Some women also find that it makes them feel sick, sleepy or unable to concentrate. If this happens, you can stop using it.
I used it for both my boys, whilst it made me slightly light headed it wasnt a horrible experience in fact when the pain was really, really bad it helped dull it.
When my DIL was in labour she found getting her breathing right really hard, (it didnt help there was a wailer next door) in the end I asked if the nurse could get her some gas and air. It both helped with the pain but also because you have to slow your breathing down and take proper breaths not pants it also help to calm her down.