Carbon dioxide. Carbon dioxide (chemical formula CO2) is a colorless gas with a density about 60% higher than that of air (1.225 g/L) that is odorless at normally encountered concentrations. Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms.
You should only do ballet in pregnancy if you are used to it. Ballet stretches can place a lot of pressure on your joints, especially your pelvic joints, and standing on one leg can cause pain in your pelvis.
Report Abuse. My doctor wouldn't let me fly during the third trimester. So, we went to visit family during the end of my second trimester. Well, I ended up in the hospital due to vaginal bleeding during my vacation. Unsure if it was related to the flying (my doctor said probably not). I know lots of other women who have flown though and not had problems, but I will never fly again (if I can help it) while pregnant. Ben's mommy Â· 7 years ago.