7 Weeks Pregnant: Baby Development

At seven weeks, your baby has grown to roughly the size of a blueberry, and this week brings rapid, visible development even though there's still nothing to see from the outside. Here's what's happening for your baby and for you.

Your baby's development this week

The embryo is growing quickly now, with several key structures taking shape:

Hands and feet are forming as small paddle-like buds, with the beginnings of webbed fingers and toes that will separate over the coming weeks.
The brain is developing rapidly, with different regions starting to form and nerve cells connecting at a fast rate.
The heart is beating strongly, typically at around 150–170 beats per minute — noticeably faster than an adult heart rate.
Facial features are starting to form, including the beginnings of the nose, and the umbilical cord is now clearly connecting baby to the placenta.

Your baby measures around 1cm from crown to rump at this stage — tiny, but developing at an extraordinary pace.

What's happening in your body

Seven weeks often marks the height of early pregnancy symptoms for many women, driven by rising hormone levels:

Exhaustion is common and can feel overwhelming — this is your body working hard to support rapid embryonic development, and rest is genuinely useful here, not just nice to have.
Morning sickness may be at its worst, despite the name it can strike at any time of day, and food aversions or sudden dislikes of previously loved foods are common.
A heightened sense of smell often accompanies nausea, making certain smells — cooking food, perfume, coffee — suddenly unbearable.
Mild bloating and cramping can occur as your uterus grows and ligaments stretch; this is usually normal, though sharp or one-sided pain, or any bleeding, should always be checked with your midwife or GP.

Looking after yourself this week

Eat small, frequent meals if nausea makes large meals unappealing — plain, bland foods are often easier to tolerate.
Keep taking your 400mcg folic acid and 10mcg vitamin D supplements daily.
Stay hydrated, sipping water regularly rather than large amounts at once if nausea is an issue.
Don't hesitate to contact your GP if vomiting is severe and you can't keep fluids down — this could indicate hyperemesis gravidarum, which needs treatment.

Frequently Asked Questions

Is it normal to feel terrible at 7 weeks?

Yes, feeling exhausted and nauseous at seven weeks is extremely common and often reflects rising pregnancy hormone levels supporting rapid early development. Many women find this period, roughly weeks 6 to 9, to be the toughest of the first trimester symptom-wise. Symptoms typically start easing by the second trimester, though timing varies from person to person.

Can I see my baby's heartbeat at 7 weeks?

A heartbeat can often be detected by ultrasound from around six to seven weeks, though this depends on accurate dating and the equipment used. If you have a private early scan or your dates suggest you're further along, a heartbeat is often visible; if it's too early to see clearly, a follow-up scan a week or two later is standard practice and not usually a cause for alarm.

What size is my baby at 7 weeks?

At seven weeks, your baby measures approximately 1cm from crown to rump, about the size of a blueberry. Growth is extremely rapid at this stage of pregnancy, and your baby will roughly double in length again over just the next couple of weeks.

This article is for informational purposes only and does not constitute medical advice.

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