Week 7
Your baby is the size of a blueberry
What's happening this week
Your baby is now the size of a blueberry — about 10mm from crown to rump — and the brain is the star of this week's development show. It's generating new nerve cells at an astonishing rate, estimated at around 100,000 new cells per minute. The brain is dividing into three distinct sections: the forebrain (which will handle thinking and reasoning), the midbrain (which will process sensory information), and the hindbrain (which will control breathing and heart rate).
The arm and leg buds that appeared last week are growing longer, and the very earliest formations of hands and feet are emerging at the tips — though they look more like tiny paddles right now. Fingers and toes will become distinct in the coming weeks. The embryo's face is continuing to develop: the lenses of the eyes are forming, nostrils are becoming visible, and the mouth is taking shape.
Your baby's digestive system is developing rapidly. The appendix and pancreas are forming, and the intestines are growing so fast that they temporarily extend into the umbilical cord because there isn't enough room in the abdomen yet. They'll migrate back in later.
The embryo still has its distinctive C-shaped curve and that small tail-like structure, though it's getting shorter each week. By the end of the first trimester, it will be completely gone. Right now, your baby looks more alien than human — but inside that tiny, curled form, an entire person is being assembled at breathtaking speed.
Your body this week
For many people, week 7 is when morning sickness shifts from 'I feel a little queasy' to 'I feel genuinely awful.' Nausea may be more persistent now, and food aversions can become intense. Things you loved last week might make your stomach turn today. This is all driven by hCG, which is still climbing steeply.
You might also notice some changes you weren't expecting: increased saliva production (called ptyalism), vivid or strange dreams, and skin changes like breakouts or oiliness. Some people experience nasal congestion — the increased blood volume in your body can cause mucous membranes to swell, making your nose feel stuffy even without a cold.
Fatigue is likely still a constant companion. First trimester exhaustion is caused by surging progesterone and the enormous energy your body is investing in building the placenta. If you can sneak in a short nap or go to bed earlier than usual, your body will thank you.
Emotionally, the reality of pregnancy may be setting in more deeply this week. It's normal to feel a mix of excitement, worry, and even moments of 'what have we done?' — these feelings coexist, and having one doesn't cancel out the other.
If you haven't had your first prenatal appointment yet, it's likely coming up in the next week or two. Start writing down any questions you have — no question is too small or too silly for your provider.
For dads
Your partner is likely deep in the trenches of first trimester symptoms right now — nausea, fatigue, food aversions, and mood swings. This is the stretch that tests patience, and here's the honest truth: you can't make her feel better, but you can make her life easier. The distinction matters. Don't try to fix the nausea with suggestions ('have you tried ginger?' is something she's already heard a dozen times). Instead, focus on reducing her load: handle the grocery shopping, take over the chores that involve smells (cleaning, cooking, taking out trash), and be patient if dinner plans change three times.
Your first prenatal appointment is likely coming up soon — usually between weeks 8 and 12. Plan to be there. This is where you'll hear the heartbeat for the first time (or see the cardiac flicker on ultrasound), and your partner will have blood drawn and a full medical history taken. Write down your own questions beforehand. Good ones to ask: What prenatal tests will be offered and when? What are the warning signs we should watch for? Is the pregnancy progressing normally? Your presence at this appointment sends a clear message: you're not just along for the ride — you're a full participant.
Common concerns
Is it normal to have food aversions this strong?+
Yes — food aversions in early pregnancy can be intense and seemingly random. Foods you normally enjoy might suddenly smell or taste repulsive. This is thought to be an evolutionary mechanism related to rising hormone levels, possibly designed to steer you away from foods that could carry pathogens. The aversions typically ease in the second trimester as hCG levels stabilize.
What will happen at my first prenatal appointment?+
Your first visit is usually the longest. Your provider will confirm the pregnancy, review your medical history, perform blood tests (checking blood type, iron levels, immunity to certain infections), and may do a urine test. Depending on timing, you may also have an ultrasound. Your provider will discuss prenatal testing options, nutrition, medications, and what to expect in the coming weeks. Bring your questions — and your partner if possible.
Is it a myth that you're eating for two?+
Mostly, yes. Despite the popular saying, you don't actually need extra calories during the first trimester. Your baby is drawing nutrition from the yolk sac and is still microscopic. Most healthcare providers recommend maintaining your normal caloric intake during the first trimester and adding about 340 extra calories per day starting in the second trimester. Focus on nutrient quality rather than quantity.
Should I be worried if I see spotting?+
Light spotting in early pregnancy is relatively common and often harmless — it can result from cervical irritation or hormonal changes. However, any bleeding during pregnancy deserves a call to your healthcare provider so they can evaluate the cause. Seek immediate care if bleeding is heavy (soaking a pad in an hour), accompanied by severe pain, or comes with dizziness or fainting. Most spotting in early pregnancy does not indicate a problem, but it's always worth checking.
Product picks for week 7
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Sour candy drops for nausea
Tart, sour flavors can cut through nausea when ginger isn't enough — keep a tin in your bag for rough moments.
Comfortable wireless bra
Your breasts may be tender and growing — a soft, wire-free bra provides support without pressure.
First trimester cookbook
Simple, bland-friendly recipes designed for when nothing sounds appetizing — focuses on nutrition when appetite is limited.
A quick note: This content is for informational purposes only and is not a substitute for professional medical advice. Always talk to your healthcare provider about any questions or concerns. Learn how we create our content.
Content based on guidance from the American College of Obstetricians and Gynecologists (ACOG), the American Academy of Pediatrics (AAP), Mayo Clinic, and peer-reviewed medical literature. Learn more about how we create our content.