Hi mama! Ang red patches na smooth lang without bumps ay pwedeng maraming causes, could be birthmarks, hemangiomas, or other skin conditions na common sa newborns, pero honestly ang best move is to check with pedia na bago pa mag-July 23 if it's really bothering you. Kung lumalaki siya o nag-change ng color/texture, I'd definitely call the clinic earlier para macheck lang agad para sa peace of mind mo, better safe than sorry with newborn skin stuff!