Aik, don't worry too much lah, lingkaran perut baby yang sedikit behind is quite common, and honestly a lot of mums I know have experienced this and baby catch up later on! At 32 weeks, normal abdominal circumference should be around 29, 30 cm, so kalau doctor cakap baby punya ukuran 31 weeks ja, dia still within reasonable range, not drastically kecil. The thing is, some babies just grow slower in the tummy area but make up for it later, my friend went to KLGH and the specialist told her the same thing, tapi by delivery her baby dah normal weight, so jangan risau sangat. What matters most is making sure you're eating well (protein, iron, fruits), staying hydrated, and keeping your check-ups regular so doctor can monitor the progress at each scan.