Alaaah congrats on your baby boy! 280g tu perfectly normal for 19 weeks, don't worry, baby boy kamu dah developing well, the ultrasound sonographer wouldn't say he's very active kalau ada issue. A few of us first-time mums were paranoid about the weight too, tapi midwife aku cakap berat akan increase drastically from now onwards, so jangan khawatir sangat! Exciting lah dapat rasa dia bergerak-gerak, one of my mum friends cakap that's when it really hits that ada baby inside hehe