⚠️ Medical Disclaimer: These tools are for educational purposes only and are not medical advice. Please consult your GP, child health nurse, or healthcare provider for any health concerns.
Free Tool

Baby Size Comparator. Week by Week

How big is your baby this week? Slide to your pregnancy week and instantly see your baby compared to a fruit or vegetable. With weight, length, and what's developing right now. Perfect for sharing with family!

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Down under, The size comparison through pregnancy is part of the journey. From poppy seed early on to a watermelon by the end. This comparator shows your babys size at each week with comparisons familiar to Australian households. We follow RANZCOG (Royal Australian and New Zealand College of Obstetricians and Gynaecologists) fetal biometry guidance and align with Australian government antenatal care recommendations.

🍓 Fruits and objects familiar in Australia

We compare to fruits and objects you find at Coles, Woolworths, ALDI, IGA, or your local grocer: poppy seed, blueberry, kumquat, passionfruit, mango, mandarin, avocado, papaya, rockmelon, pumpkin, watermelon. Plus household items like a 5 cent coin, ping pong ball, lemon, cricket ball. Standard RANZCOG biometry charts back the measurements. Your sonographer and obstetrician use Australian standard ultrasound biometry at the dating and anomaly scans.

🤱 Baby Size Comparator. Week by Week

See how big your baby is this week. Compared to fruits and vegetables you know 🍋🍉

Week 4 Week 40
WEEK 20
🍌
Banana
🗓️ Quick Week Navigation
Step-by-Step Guide

How to use this tool

Drag the slider to your current pregnancy week and instantly see your baby's size comparison, weight, length and development highlights.

  1. 1
    Drag the slider to your pregnancy week

    The slider goes from week 4 (implantation) to week 40 (due date). Drag it to your current week to see your baby's size comparison. If you are not sure of your week, use the Due Date Calculator first.

  2. 2
    See the fruit comparison and stats

    The large emoji and name shows what fruit or vegetable your baby is roughly the same size as this week. The three boxes below show the exact week number, average baby length in centimetres, and average weight in grams or kilograms.

  3. 3
    Read the development description

    Below the stats is a paragraph describing what is happening inside your womb this specific week. What organs are forming, what your baby can sense, and what major milestones are being reached.

  4. 4
    Use the quick navigation buttons

    Tap any of the quick navigation buttons (12 weeks, 16 weeks, 20 weeks etc.) to jump to key milestones. Share a screenshot on WhatsApp with the message "My baby is a mango this week!". Friends and family love it.

💡 Take a weekly photo with the fruit

A fun pregnancy tradition: take a photo every week holding the fruit your baby is compared to. By the end of 40 weeks, you have a beautiful collection showing your whole pregnancy journey from poppy seed to watermelon. This makes a wonderful memory book.

⚠️ These are average sizes only

All measurements shown are averages for that gestational age. Your baby's actual size may be slightly larger or smaller. Both are completely normal. Small or large ultrasound measurements only become a concern if they are significantly outside the normal range across multiple scans. Always discuss ultrasound measurements with your doctor.

FAQ

Frequently Asked Questions

In the first 20 weeks, babies are measured from crown (top of head) to rump (bottom). Called CRL (Crown-Rump Length) because legs are curled up. After 20 weeks, babies are measured from crown to heel. Called CHL. This is why the measurements shown seem to jump significantly around week 20-21. It is a change in measurement method, not sudden growth.
The average birth weight for Australian newborns is approximately 2.8 kg, which is slightly lower than the global average of 3.3 kg. Low birth weight (under 2.5 kg) is more common in Australia due to maternal nutrition and socioeconomic factors. A healthy Australian newborn typically weighs between 2.5 kg and 3.5 kg. Weight below 2.5 kg at birth requires paediatric monitoring.
No. Ultrasound measurements have a margin of error of ±1-2 weeks. Your baby may simply be slightly smaller or larger than average. Which is perfectly normal. Growth concern arises when measurements are consistently below the 10th percentile across multiple scans, or when growth slows significantly between two scans. Your doctor will flag any actual concerns.
Most first-time mothers feel baby movements (called quickening) between 18-25 weeks. Experienced mothers often feel movements earlier, around 16-18 weeks, because they recognise the sensation. Baby movements feel like gentle flutters, bubbles, or a light tapping at first. By 28 weeks, you should feel at least 10 movements in 2 hours daily. Contact your doctor if movements reduce significantly.
Healthcare in Australia

How prenatal scans actually work in Australia

Australian pediatric care runs through a mixed public-private system. Medicare covers GP visits and public ED visits. Many families also have private health insurance for faster specialist access. Your first call for after hours fever or illness is typically Healthdirect on 1800 022 222. Free, 24/7 nurse line. The Maternal and Child Health Nurse system is one of the best in the world. Free and accessible. Royal Childrens Hospital Melbourne, Westmead in Sydney, Queensland Childrens, Perth Childrens. These are the specialty ED centres for serious cases. For rural and remote families, telehealth through 13Health in Queensland or HealthDirect federally is critical. Royal Flying Doctor Service covers the genuinely remote stuff.

📞 Emergency contacts in Australia

In Australia, call Healthdirect on 1800 022 222 for free 24/7 health advice. For emergencies, call 000. Maternal and Child Health Nurses (free in most states) help during business hours. Your GP is the first point of contact. The Tresillian Parent Helpline (1300 272 736) also handles concerns about babies.

Context for Australian families

What Australian mums actually deal with

Aussie mums tend to be pragmatic about baby illness. Cultural default leans toward "she will be right." Combined with reasonable access to nurses and GPs, this generally works. The Maternal and Child Health Nurse system is a treasure of the Australian health system. Use it without hesitation. Telehealth normalised during COVID and stayed normalised, which is genuinely useful. The unique Aussie concerns are bushfire smoke season and extreme summer heat. Babies are more vulnerable to air quality than adults. Sun and heat exposure can cause apparent fever via overheating. Always check core temperature properly (rectal or under-arm thermometer), not just the forehead, especially in summer.

More FAQs for Australia

Australian-specific questions

Standard Australian antenatal care includes a dating scan around 7 to 10 weeks, a nuchal translucency scan at 11 to 13 weeks (optional), and a morphology scan at 18 to 22 weeks. Many obstetricians also order a third trimester growth scan around 32 to 36 weeks, especially for first pregnancies. Medicare rebates apply to medically indicated scans, reducing out of pocket cost significantly. Bulk billed radiology practices provide scans at no cost beyond the Medicare rebate. Private health insurance may cover additional scans. 3D and 4D bonding scans are usually private and cost 100 to 300 AUD.
Australia has multiple care models. Shared care between your GP and hospital midwives is common for low risk pregnancies and is widely available. Public hospital midwifery care is free and excellent. Private obstetrician care costs significantly more (3000 to 7000 AUD out of pocket for the full pregnancy) but gives you continuity with one specialist. Many Australian women choose shared care for cost and quality. Indigenous and rural women often have access to specific dedicated programs. Discuss options with your GP at your first appointment.
The morphology scan at 18 to 22 weeks can usually determine sex. Most Australian sonographers will tell you on request. NIPT (non invasive prenatal testing) from 10 weeks can determine sex and chromosome conditions; costs 400 to 500 AUD with Medicare rebate of around 150 AUD if your GP refers. Private gender scans from 15 to 16 weeks cost 60 to 100 AUD. Some Australian women choose to have a gender reveal surprise at birth, which is becoming more popular as a trend.
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