Baby is the size of a blueberry
👶 Baby's development
The brain develops rapidly. Eyes, ears, mouth and nose are taking shape. The tail has almost gone.
💛 How mom feels
Increased salivation may occur. Some smells become unbearable.
📖 Tip of the week
The baby's brain is growing at an incredible rate — thousands of neurons form every minute. The tail disappears and the embryo looks increasingly human. Avoid hot baths and saunas — overheating is dangerous for the neural tube at this stage.
🔬 Detailed baby development
- The embryo's brain is growing rapidly, producing about 100 new brain cells per minute
- Arm buds develop further and tiny hand plates begin to form at the ends
- The liver starts producing red blood cells, taking over from the yolk sac
- Facial features become more defined with a recognizable mouth and tiny nostrils
- The appendix and pancreas begin to develop within the digestive system
- The embryo is about 10 mm (1 cm) long, roughly the size of a blueberry
🤱 What mom may feel
- Morning sickness may worsen as hCG levels approach their peak
- Increased saliva production (ptyalism), which is normal but annoying
- Constipation due to progesterone relaxing intestinal smooth muscle
- Frequent urination continues as blood volume increases and kidneys work harder
- Acne or skin changes caused by hormonal fluctuations
🏥 Tests and check-ups
No specific tests are typically scheduled for week 7. If you haven't had your first prenatal visit yet, it should happen soon. Your provider will discuss screening options for chromosomal abnormalities and plan upcoming tests.
💡 Tips for this week
- Increase fiber intake (whole grains, fruits, vegetables) and drink plenty of water to combat constipation
- Consider starting a pregnancy journal to track milestones and symptoms
- Gentle walking or swimming can help with digestion and boost energy
- If constipation is severe, ask your doctor about safe stool softeners like docusate sodium
- Start researching prenatal care providers and birth settings if you haven't chosen yet
❓ Frequently asked questions
Is it safe to take a bath in early pregnancy?
Warm baths are safe, but avoid hot tubs and water above 38C (100F). Elevated core body temperature in the first trimester can increase the risk of neural tube defects.
Why do I produce so much saliva?
Excess saliva (ptyalism gravidarum) is thought to be related to nausea and hormonal changes. It usually resolves after the first trimester. Sucking on ice chips or sour candy may help.
Can stress harm my baby at this stage?
Everyday stress is unlikely to harm your baby. However, chronic high-level stress may affect pregnancy outcomes. Practice relaxation techniques, get adequate sleep, and ask for support when needed.
📝 Week 7 of pregnancy: detailed guide
At week 7, the embryo has grown to about 1 cm — approximately the size of a blueberry — and is developing at a remarkable pace. The brain is producing around 100 new neurons per minute, and the cerebral hemispheres are beginning to form. The arm and leg buds are lengthening and differentiating, with paddle-shaped hands appearing. The embryonic tail is receding. The kidneys are beginning to function, producing trace amounts of urine into the amniotic fluid. The facial features are becoming more distinct — pigmented retinas are visible in the developing eyes, and the nostrils, ears, and upper lip are taking shape. The liver is producing red blood cells while the bone marrow develops this capacity.
Fatigue at week 7 can be profound — the kind that is not relieved by a full night’s sleep. This is caused by the enormous energy demands of building a placenta, producing extra blood, and sustaining soaring hormone levels. Progesterone also has a relaxing effect on smooth muscle, which is why you may notice bloating, constipation, and slowed digestion. Some women find that their skin becomes oily and prone to breakouts due to rising androgen levels. Mood swings — from calm to tearful or irritable within minutes — are a normal and entirely hormonal response; be kind to yourself and ask for support from those around you.
If your booking appointment with your midwife has been confirmed, start gathering your health history: past pregnancies, any chronic conditions, family history of genetic conditions, and a list of current medications. Inform your employer of your pregnancy by 15 weeks before your due date at the latest to protect your maternity rights under UK law, though many women choose to wait until after the 12-week scan. If you have not yet had a smear test, it may need to be deferred until after the birth. Continue your daily folic acid and vitamin D supplements without fail.
Constipation is a common complaint at this stage — progesterone slows the digestive tract and iron in prenatal vitamins can compound the problem. Increase your intake of high-fibre foods: wholemeal bread, oats, bran cereals, beans, lentils, dried fruit (prunes and apricots are particularly effective), and plenty of vegetables. Aim for at least 25–30 g of fibre daily. Regular gentle movement such as walking for 20–30 minutes each day stimulates bowel motility. Do not use stimulant laxatives without speaking to your midwife or GP first — they are generally not recommended in the first trimester.
⚠️ When to see a doctor
- Heavy bleeding or spotting
- Severe abdominal pain or pain on one side
- Severe nausea and vomiting (unable to eat or drink)
- Fever above 38°C (100.4°F)
- Pain or burning during urination
- Dizziness or fainting
Sources
- WHO recommendations on antenatal care (2016)
- ACOG Practice Bulletins
- Williams Obstetrics, 26th Edition
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