My friend's 2-year old daughter throw up everytime they commute to places, either by taxi or shuttle. Is there any way to avoid this?

Though it is not clear what causes motion sickness to children, most believe in the superstition that those affected are just not used to travelling by airconditioned vehicles. Distracting the child may help in preventing this. Encourage your friend to make her daughter lurk outside the car, listen to music, sing songs, or tell stories to do this. Avoiding the use of strong car fresheners may lessen the risk of barfing too.