How big is the fetus at six weeks of pregnancy considered normal?

Patient's question:

No

Doctor's answer:

Around 6 weeks of pregnancy, the gestational sac can be observed. Around 8 weeks of pregnancy, the primitive heart tube and fetal bud can be observed. Around 5 weeks of pregnancy, the size of the gestational sac is 0.9-3.2 cm, and around 6 weeks, it is 1.1-3.7 cm. Strengthen nutrition and undergo regular prenatal examinations.