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A member asked:
How many weeks is the baby if the ultrasound says "gs 1.11 cm" ? thank you!!
A doctor has provided 1 answer
Here's the math.: The gestational sac is usually measurable about 3 weeks after conception (5 weeks after first day of LMP) and is only 2-3 mm at that time. The mean gestation sac diameter (MSD) increases by about 1 mm a day in early pregnancy. 1.11 cm is ~11 mm. So the baby is 21+8 or 9 days (~4 1/2 weeks) along based on date of conception. Wow. Amazing!
Answered 4/30/2015
2.9k views
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