The plastic 'womb' consists of a mixture of warm water and added salts, similar to amniotic fluid, to support and protect the foetus.
Researchers were inspired by toys such as a yoyo and whirlygig that is made using a spherical object suspended on threads which are then pulled to make it spin.
In this analysis of previous studies, researchers from the University of Canberra looked at the effects of at least four weeks of structured physical exercise on the brain function of adults.
When children eat to soothe their negative feelings, their food tends to be high in calories (eg, sweets) so they consume more calories.
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