At 4 weeks what is the baby size?

At 4 weeks of pregnancy, the developing baby is still in the very early stages and is about the size of a poppy seed. It's important to remember that at this stage, it's not technically a baby yet, but rather an embryo.

The embryo is only about 1/25th of an inch (1 mm) in length, and its major organs are just beginning to form.

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