When did your claustrum come in?

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With my first it was around 30 weeks and I don't remember with my second but I haven't any yet with this one and I'm almost 38 weeks. It's different for everyone and some don't have it until after birth

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After the baby was born. Before that anything that came out looked clear, not even milky

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When baby was born.

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I'm sorry, ive never heard of this term before. What does it mean? This is my first baby.