He cannot talk in words yet. But he can talk by showing us what he feels through his behaviour. He is not being difficult. He is just 'telling' his mum what he feels, hoping that she will understand and help him think about it by 'saying it back to him in words'.
Pictures and text on this page from our book "In the Family" by Sibylle Janert, illustrated by Claudia Schenk
Empowering Parents Through Family Centred Intervention