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Week 13 · 1st Trimester
Your baby is the size of a peach
📏 Length: 7.4 cm⚖️ Weight: 23 g
Fingerprints are forming — completely one of a kind.
You're in the first trimester — the foundation weeks. Your baby's major organs, brain, and heart are all taking shape, and your body is working harder than it ever has (which is why you're so tired). Every week brings a big developmental leap.
Follow every week with insights, an AI companion & a journal — free to start
Lengths and weights are averages (crown-to-rump until week 19, head-to-toe after) — every baby grows at their own pace. This page is for general information and isn't medical advice; always consult your healthcare provider.