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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Should Be The Ideal Size Of A 5.4 Week Fetus?

I had a early pregnancy scan believing I was 6 weeks 4 days, in fact I measured at 2mm but saw a heart beat. The sonogram said I must be 5.4week, which is possible. I am more concerned that when I go back in 2 weeks time they will say that the baby had stopped growing. Does 2mm seem normal for a 5.4 week embryo
Mon, 15 Dec 2014
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General & Family Physician,  's  Response
ek Five: The embryonic stage begins

You are 5 weeks pregnant. (about three weeks from conception)
The amniotic fluid is being built up.
The embryo grows from a tiny speck about 2mm - the size of a pin head.
By the end of the week the embryo will have more than doubled in size to about 4-5mm.
The egg has now completely grown into the mucous membrane of the uterus which covers the egg, the umbilical sac and the amniotic fluid cavity.
A fibrin clot closes the hole to the uterus cavity.
The placenta is developing.
The embryo starts receiving oxygen and nutrition through the placenta.so it is around 3mm size.
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What Should Be The Ideal Size Of A 5.4 Week Fetus?

ek Five: The embryonic stage begins You are 5 weeks pregnant. (about three weeks from conception) The amniotic fluid is being built up. The embryo grows from a tiny speck about 2mm - the size of a pin head. By the end of the week the embryo will have more than doubled in size to about 4-5mm. The egg has now completely grown into the mucous membrane of the uterus which covers the egg, the umbilical sac and the amniotic fluid cavity. A fibrin clot closes the hole to the uterus cavity. The placenta is developing. The embryo starts receiving oxygen and nutrition through the placenta.so it is around 3mm size.