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At 5 weeks your baby is about the size of an apple seed

First trimester · Weeks 4 to 13

5 Weeks Pregnant

Your baby is about the size of an apple seed.

Length

0.05"

Weight

under 1 g

To go

35 wks

Week 4You are here · week 5Week 40

Your baby

What is developing at 5 weeks

This week the neural tube, which becomes your baby's brain and spinal cord, is forming, and the earliest heart cells are beginning to organize. The embryo is about the size of an apple seed and is growing rapidly in these foundational days. Tiny structures that will become major organs are starting to take shape.

Your body

What you may be feeling

Pregnancy hormones are climbing, so you may notice more fatigue, tender or swollen breasts, mild nausea, or a heightened sense of smell. Some people feel many symptoms while others feel almost none, and both are normal. Frequent trips to the bathroom can also begin around now.

This week

Tips for week 5

Keep taking your prenatal vitamin and try to rest when your body asks for it. If nausea is starting, small frequent snacks and staying hydrated can help. This is a good time to confirm your first prenatal appointment and jot down any questions you want to ask.

Following along week by week?

Try our baby size tool, due date calculator, and food safety checker, and book your prenatal care with Garden OB/GYN across Brooklyn, NYC, and Long Island.

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About this guide

This page is general educational information, compiled from publicly available guidance from trusted medical sources, including the NHS and MedlinePlus. It is not medical advice from Garden OB/GYN or its providers, and it is not a substitute for care from your own clinician. Every pregnancy is different, so always talk with your OB/GYN about your specific situation. See our full medical disclaimer.