Sayang, sebab baru 23 hari lepas bersalin, chest pain mcm ni kena ambik serius, please see your doctor or go to klinik/hospital hari ni juga, ok? Especially sebab sakit tiba-tiba dan gerak tangan pun terasa, better safe than sorry lah. Could be many things postpartum (engorgement, muscle strain dari nursing position, or something else) but doctor needs check properly, bukan boleh guess je. A few of my mum friends had similar scares and alhamdulillah turned out ok, but they semua went in to get it checked. Jangan delay, auntie, go see your gynae or GP today.