Hello, second trimester 💛

Welcome to a brand-new chapter. Week 13 is the first week of the second trimester, which many mums describe as a gentler stretch. Let's see what's new for you and your little one.

📌 Week 13 at a glance

• Trimester: Second (first week)
• Baby's size: about the size of a peach (around 7.4 cm)
• Still to come: roughly 27 weeks (a typical pregnancy lasts around 40 weeks)

🌱 Your little one this week

At 13 weeks, your baby is about 7.4 cm long, roughly the size of a peach, and weighs around 25 g. The ovaries or testes are now fully developed inside the body, and final touches are being made on the outside.

Your baby is moving around. At first the movements are jerky and random, and then they start to look more deliberate. You probably won't feel them until around week 17. Some babies even suck their thumb in the womb, which helps develop the sucking reflex they'll need for feeding.

🌷 And how about you, Mum?

Many mums find that the second trimester brings a lift. Nausea often eases, your appetite may come back, and tiredness can start to lift. A small bump may become visible as the womb grows upwards and outwards, and the urge to pee so often usually eases as the womb moves away from the bladder. Extra blood flow around the pelvis can also make you feel thirstier, so keep sipping fluids.

If you still feel tired or queasy, that's okay too. There's no deadline for feeling energetic again.

🍽️ Food for thought: vitamin B12

Vitamin B12 helps your body make red blood cells and keeps the nervous system working normally. It is found mainly in foods that come from animals.

Everyday foods that contain vitamin B12 include:

• Eggs
• Milk, yoghurt and cheese
• Fish and other seafood
• Chicken and other meat
• Foods fortified with B12, such as some soy milks and cereals

If you eat mostly plant-based foods, your doctor, midwife or dietitian can guide you on B12 and what suits you best.

A gentle food-safety reminder: some foods are usually advised to be avoided in pregnancy, including undercooked meat, cured meats such as salami, and unpasteurised dairy such as goat's milk and cheese. Your doctor or midwife can share the full list that applies where you live.

✨ Little things that may feel nice

• Many mums enjoy using returning energy for a gentle walk or a swim
• Regular, balanced meals can feel good as your appetite returns
• A supportive bra and loose, comfortable clothes can help as your body changes
• Gentle pelvic floor exercises can be a nice habit to start now
• This is a nice time to jot down questions for your next visit

🩺 Coming up

In the second trimester, routine antenatal visits continue, and many clinics check your blood pressure, your urine and your baby's growth each time. A detailed mid-pregnancy scan is usually offered in a few weeks. Your doctor or midwife can tell you what to expect and when.

👨‍👩‍👧 Partner's corner

The second trimester is often a lovely time to feel more involved. You might plan a baby-name chat, a little shopping trip, or simply spend a relaxed evening together. Small moments like these mean a lot.

❓ Quick questions

When does the second trimester start?
It usually starts around week 13 and runs until about week 27.

Will my energy come back now?
Many mums feel a lift around now, though everyone is different. Some feel better a little sooner, some a little later.

💛 A little moment for the two of you

Thirteen weeks. The first trimester is behind you, and your baby is already moving and stretching in there.

Hello, second trimester. We're glad you're here. 🦕

Sources & further reading

NHS — 13 weeks pregnant
NHS Week 13 pregnancy guide

Ministry of Health Malaysia (KKM) — Antenatal care
KKM maternal health and antenatal care

FirstDino shares general pregnancy information for education and comfort. It is not medical advice, and every pregnancy is different. Please speak with your doctor or midwife about your own health and care.