How Much Is the Baby Developed at 4 Weeks?

Congratulations on your pregnancy! It’s an exciting time, and you’re probably eager to know everything you can about your growing baby. At four weeks, your baby is still tiny, but a lot of important things are happening. Let’s take a closer look at how much your baby is developing at this early stage.

Size and Shape

4 Week FetusSource:

At four weeks, your baby is about the size of a poppy seed, measuring just 0.04 inches. It might not seem like much, but that little seed is starting to take shape. The fertilized egg has divided into multiple cells, forming a ball known as a blastocyst. The blastocyst will soon implant itself into the lining of your uterus, where it will continue to grow.

Organ Development

Although your baby is still tiny, the organs are beginning to form. At this stage, the neural tube is forming, which will eventually become the brain and spinal cord. The heart is also developing, and a primitive circulatory system is beginning to take shape. Your baby’s digestive system, lungs, and kidneys are also starting to form.


At four weeks, your baby is still too small to be felt moving, but that doesn’t mean there’s no activity. The cells of the blastocyst are dividing rapidly, and the ball is starting to change shape. The tiny heart is beating, and blood is starting to flow. Your baby might even be starting to move a little bit, although you won’t feel it yet.

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Mom’s Symptoms

At four weeks, you might not even know you’re pregnant yet. Some women experience mild symptoms, such as cramping, spotting, or breast tenderness. Others don’t feel any different at all. If you suspect you might be pregnant, it’s a good idea to take a home pregnancy test or make an appointment with your doctor.


At four weeks, your baby might be tiny, but it’s already starting to take shape. The organs are beginning to form, and the heartbeat is starting to beat. Although you might not feel any different, your body is hard at work supporting your growing baby. Enjoy this exciting time, and don’t hesitate to reach out to your doctor if you have any questions or concerns.

Frequently Asked Questions

Q: Can I have a miscarriage at four weeks?

A: Unfortunately, miscarriages can happen at any stage of pregnancy. However, the risk is highest in the first trimester. If you experience cramping, bleeding, or other symptoms, contact your doctor right away.

Q: When will I start to feel my baby move?

A: Most women start to feel their baby move between 16 and 25 weeks. However, every pregnancy is different, so it’s possible to feel movement earlier or later.

Q: Is it safe to exercise during the first trimester?

A: In general, it’s safe to exercise during pregnancy, but you should talk to your doctor first. They can advise you on the best types of exercise and any precautions you should take.

Q: Can I dye my hair during the first trimester?

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A: While there’s no definitive answer, many doctors recommend avoiding hair dye during the first trimester. If you do choose to dye your hair, opt for ammonia-free products and make sure the area is well-ventilated.

Q: What should I do if I’m feeling anxious about my pregnancy?

A: It’s normal to feel anxious during pregnancy, especially in the early stages. Make sure you’re taking care of yourself with plenty of rest, healthy food, and exercise. Don’t hesitate to talk to your doctor or a mental health professional if you’re feeling overwhelmed.

Remember, every pregnancy is unique, and your experience might be different from someone else’s. Trust your instincts, take care of yourself, and enjoy this exciting time!

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