Cognitive tests and play sessions showed there was no difference, either, in behavioural development at 18 months.

This suggests evidence of early behavioural formation, what can become particularly harmful in the emotional and behavioural development of the male in later years.

These responses can drastically hinder an individual's ability to perform well and negatively affects their social emotional and behavioural development and feelings about themselves and school.

The book provides a series of home-based experiments that can be performed on infants aged birth to two years to test their cognitive, motor, social and behavioural development.