The origin place of behavioural instincts in children is –

The science of heredity is a discipline contributing specific details of the impact of heredity on living beings.

Key Points The origin place of behavioral instincts in children is heredity. Tendency to function in certain ways includes the following behaviors:

• Natural response i.e. functioning of the nervous system, intelligence, predisposition to react slowly or quickly.
• Sensory efficiency i.e. keenness of vision, range of hearing, the sensitivity of touch and smell.
•  Operation of the "vegetative system" i.e., heart and circulatory system, digestive system, reproducers system, etc.
• Functioning of the endocrine system is., glandular secretions, e.g., the control of the thyroid the metabolic rate, the pituitary controlling growth, gonads controlling the sex-drive and sex characteristics, and the adrenals controlling emotional "stir-ups".
• Rate of physical growth.
• Predisposition to certain characteristics.

Finally, a note must be added that the effects of heredity on temperamental quality are not fatalistic as these are on the structural tendency. 

Thus, it is concluded that the origin place of behavioral instincts in children is heredity.