Mean and range of the gestational age at the first
ultrasonographic detection of the fetal structures
Embryo 22.80±1.03 21-24
Heartbeat 23.00±0.94 22-24
Limb bud 29.70±0.82 28-31
Fetal movement 30.40±1.64 28-31
Stomach 33.40±1.07 32-35
Gall bladder 32.90±1.73 31-35
Urinary bladder 34.90±1.19 33-37
Skeleton 35.10±0.73 34-36
Lung 36.10±0.51 35-37
Liver 35.40 ±0.70 35-37
Nickel's waist measured 22 1/2 inches this morning
