Nak tengok doctor sebab arm pain boleh ada banyak causes, bisa dari posisi tidur, ngangkat baby berulang kali, atau carpal tunnel yang common pada new mums especially kalau banyak pegang baby, express milk, atau scroll phone. Sementara tu cuba rest lengan sikit, warm compress boleh tolong, dan posisi tidur better if possible so lengan tak tertekan. One of my mum friends kena same thing masa early days with her first, okay je after a few weeks but she still went to the doc to make sure. Jangan pakai painkillers heavy-heavy, better confirm dengan doctor dulu especially if you're breastfeeding.