Mak, fundal height memang boleh vary jugalah, ada yang lebih kecil atau lebih besar sikit dari expected, bukan semestinya ada masalah! But kena ingat, setiap perut lain-lain (position of baby, amount of fluid, mama's built semua factor), so 17cm at 21 weeks memang agak on the smaller side, tapi doc lah yang tengok the full picture including ultrasound dan everything else. Best kalau tanya doc directly why it's lower than expected dan if they want to monitor closely or do another scan, jangan worry dulu, tapi definitely worth clarifying so you feel confident!
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