Gaston is jealous
The book tells the child that this is a completely natural reaction, which can be accompanied by uncertainty, fear of losing something important, imaginary, unwillingness to share something with another (attention of parents, their time, etc) This emotion of which can be learned to control, expressing it with the help of non -hazardous for yourself and surrounding movements, through physical activity, through words and sounds.
This book also explains to parents what to do if the child is jealous, teaches to accept the child’s right to this emotion and help the baby express it