For use as a practical aid in teaching children, either individually or as a group, the development of a human's or other animal's foetus within its parent a doll 10, which in this instance is in the form of a pregnant human being, comprises a body 12 having an opening in its abdomen 15, said opening being fastenable by a zip fastener 16 and through which opening any one of a number models 17 of the human foetus, each model representing the foetus in a particular stage of development, are insertable into the body 10. IMAGE
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