They will discuss it with you and your child.
Before the PICC is placed, they can tell you the type of catheter they have chosen and why.
Sometimes when the catheter is placed, the person putting it in may use something to hold the catheter in place. This is called a securement device. One brand name is called a Statlock. Some dressings have the securement device built in. This will be changed every week as a part of the dressing change.