Sayang, soalan ni memang kena tanya doctor kat scan, sebab berat baby dalam womb tu boleh vary quite a bit depending on genetics, nutrition, and other factors. Jangan worry dulu, 22 weeks is still early and timing of scans boleh buat beza jugak. Next checkup, just mention to your gynae that you want to confirm baby's growth is on track, okay? That's what they're there for. Mum friends around me, some babies were smaller early on tapi grow perfectly fine, so try not to stress too much first.