You will need to change the complete look that is the wall colors, furniture, wardrobes, and even the electrical fittings for safety and accessibility. It’s a huge task but worth the effort.

To begin with change a few basic things as per the child’s requirement like the bed and other small elements. Later on you can keep changing the wall color etc. As such as the child grows he will identify his own needs.

Let him decide what all he requires. Refurnish and redo the complete look.