Your baby's developing eyesight
He'll have learned to focus both eyes together and will be able to track moving objects. He prefers black and white or high-contrast colours at first. But towards the end of this stage, he'll start showing a preference for bright primary colours and more detailed designs and shapes.
What can I do? Whether you choose specially designed developmental toys for him, or adapt everyday household objects, he'll be transfixed by shiny foil or a bright plastic ball. Try moving a rattle from side to side in front of his face and watch him watching it!