What Is a Yolk Sac? A yolk sac is a small pouch made from thin membranes. The yolk sac is one of the first things to develop during pregnancy and one of the first things your healthcare provider will ...
At 5 weeks, your baby is only about the size of a peppercorn. The only things you’re likely to see on an ultrasound are the yolk sac and the gestational sac. And even those may not be visible. Share ...
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