Newborn clothes

Destiny • Baby boy on the way 10/27/18👶🏾💙

So my mom keeps telling me that she doesn’t think my baby will fit into newborn clothes since he’s already measuring at 8lbs and has been ahead in growth throughout my whole pregnancy. Do you recommend that I still keep some of the newborn stuff I have or try to return them and exchange for bigger sizes? I’m a ftm so I’m not sure if even big babies fit into nb clothes. It’s not much I definitely have way more 0-3/3-6 month clothes. In nb I have about 5 outfits ? Should I just keep them ?