My DS (5 yrs) has started weeing in objects that shouldn't be wee'd in ! He did it a year ago in the toy box in his bedroom we talked to him about it and it was not repeated so we forgot about it. This week so far he has done it in the toilet brush holder, DD's boot and just now a toy water gun. When questioned he denies it was him and gets really cross when we explain it could only have been him. He later admits to it but doesn't know why he does it.
Is this a normal "boy " thing that he will grow out of or something else. Any advice gladly received.