Child Protective Services?

Hannah
So I know this couple who recently had a baby. They leave the baby with their parents for several days without seeing her. They are out partying and doing drugs, weed, cocaine and acid. They spent $100 on cocaine then asked a friend if they could borrow some money to help get dipers. They don't tell their parents any of this. They say that they are "catching up on some sleep". I feel like I should report them but I'm not sure. Anyone have any input and if I should what do I do?