Baby Fruit Size Comparison: How big is my baby?

Working out your baby’s size by comparing the impending arrival to various foodstuffs is a fun and handy way to understand the different stages of your bub’s growth, and when it comes to estimating your baby by week, fruit and veggies are great comparative tools. So, to help you answer the question, ‘How big is my baby?’ as your pregnancy progresses, we’ve pulled together your ultimate baby fruit size guide.

Ready to find out your baby’s size by week? Read on to stay on top of your pregnancy fruit size for your whole 9 months.

You can also download your own copy of our New Beginnings Baby Size chart!

Size of baby at 1-3 weeks?

When it comes to the very, very early life of your baby, fruit doesn’t quite come into play just yet. In the first few weeks – when you likely don’t yet know you’re expecting! – that little foetus is barely more than a cluster of cells preparing itself to become a tiny human. But don’t you worry… that little seed is about to start growing, and in no time you’ll be able to proudly share your baby’s fruit size!

Size of baby at 4 weeks?

At 4 weeks, your baby is still very small! In fact, it's hard to find a fruit that's small enough to compare. Imagine the size of a poppy seed or a kiwifruit seed—this is roughly the size of your baby at 4 weeks. At this early stage, your baby is little more than a ball of rapidly dividing cells. But don't worry, changes are on the way!

Length and Weight at 4 Weeks:

• Length: Around 0.04 inches (1 mm)
• Weight: Just a fraction of an ounce (about 0.02 oz or 0.5 grams)

As your baby continues to grow, you'll start noticing significant changes in the coming weeks!

Size of baby at 5 weeks?

At 5 weeks, your baby is still tiny but growing rapidly! At this stage, your little one is about the size of a sesame seed. During this time, significant developments are happening—your baby's brain, spinal cord, blood vessels, and heart are all beginning to form. Exciting changes are underway, as the foundation for more complex body systems is being established.

Length and Weight at 5 Weeks:

• Length: Around 0.1 inches (2.5 mm)
• Weight: Roughly 0.07 oz (2 grams)

At this early stage, your baby’s body is working hard to develop crucial structures that will support growth in the weeks to come.

Size of baby at 6 weeks?

If you've been wondering, "How big is my baby at 6 weeks?" take a look at a lentil. That's about the size of your little one now! Over the past week, your baby has grown significantly, and you might even notice some early signs of movement and development. It’s an exciting time as your baby's organs continue to form and your little one gets ready for further growth.

Length and Weight at 6 Weeks:

• Length: Around 0.25 inches (6 mm)
• Weight: Approximately 0.1 oz (3 grams)

At this stage, your baby’s tiny body is developing at an impressive rate, preparing for the weeks ahead!

Size of baby at 7 weeks?

At 7 weeks, your baby is about the size of a blueberry—small but growing fast! Measuring around 1 cm long, your little one is developing rapidly, with major organs starting to take shape. This is a crucial time for growth as the baby’s limbs, facial features, and tiny heart continue to develop, making your baby a little more recognizable every day.

Length and Weight at 7 Weeks:

• Length: Around 1 cm
• Weight: Approximately 0.2 oz (5 grams)

As your baby gets bigger, so do the signs of progress in their growth and development!

Size of baby at 8 weeks?

At 8 weeks, your baby is about the size of a kidney bean, measuring around 1.6 cm from head to bottom. This week marks a huge milestone in development, as your little one now has fingers and toes! Although they’re still webbed at this stage, they’ll begin to form more distinct digits in the coming weeks. Your baby’s body is growing rapidly, with more complex features developing, including the beginnings of ears and eyelids.

Length and Weight at 8 Weeks:

• Length: Around 1.6 cm (head to bottom)
• Weight: Approximately 0.3 oz (8 grams)

It’s amazing how much change can happen in just a short period of time! Your baby is growing more recognisable and developing at a rapid pace.

Size of baby at 9 weeks?

At 9 weeks, your baby has officially graduated from embryo to fetus status! Your little one is now around the size of a grape, measuring about 2.3 cm long and weighing in at 2 grams. At this stage, your baby is continuing to develop rapidly, with more recognizable features like the start of a tiny nose and upper lip. While your baby's body is elongating, they still have a lot of growing to do!

Length and Weight at 9 Weeks:

• Length: 2.3 cm (head to bottom)
• Weight: 2 grams

As your baby’s tiny body continues to form, their heart is beating strongly, and their facial features are becoming more defined each day.

Size of baby at 10 weeks?

At 10 weeks, your baby is about the size of a kumquat, measuring around 3.1 cm in length and weighing approximately 4 grams. This is an exciting week as your little one starts developing some more unique features – like tiny eyebrows! While your baby’s body is still growing, they are also becoming more defined, with their arms and legs now clearly separated.

Length and Weight at 10 Weeks:

• Length: 3.1 cm (head to bottom)
• Weight: 4 grams

Your baby’s facial features are becoming more recognizable, and they’re busy forming other key characteristics like hair follicles, nails, and even their unique fingerprints. How amazing is that?

Size of baby at 11 weeks?

At 11 weeks, your baby is about the size of a fig, measuring around 4.1 cm in length and weighing approximately 7 grams. This marks a significant stage as your baby’s facial features become even more distinct, and they begin to look more human-like. Their skin is still translucent, but you can start to see more development with tiny nails starting to form on their fingers and toes.

Length and Weight at 11 Weeks:

• Length: 4.1 cm (head to bottom)
• Weight: 7 grams

Your little one is becoming more active, with muscles developing and movements becoming smoother, even though you won’t feel them just yet. It’s a wonderful time to be witnessing these tiny, but incredible, milestones!

Size of baby at 12 weeks?

At 12 weeks, or approximately 3 months, foetuses are around the size of a lime (5.4cm; 14g) and are beginning to form fingernails, toenails and bones.

Length and Weight at 12 Weeks:

• Length: 5.4 cm (head to bottom)
• Weight: 14 grams

By week 12, you might notice your clothes beginning to feel a bit tight. Wearing a maternity bra and maternity leggings will help support your growing bump and changing body. 

Size of Baby at 13 Weeks?

At 13 weeks, your baby is still relatively small, measuring about the length of a pea pod. Their body is rapidly growing, and the basic structures are continuing to develop as they move toward their second trimester.

• Length: 7.4 cm
• Weight: 23 grams

Size of Baby at 14 Weeks?

Welcome to the second trimester! By week 14, your baby is about the size of a peach. They're becoming more active and can now squint, frown, grimace, pee, and maybe even suck their thumb. Exciting milestones ahead!

• Length: 8.7 cm
• Weight: 43 grams

Size of Baby at 15 Weeks?

At 15 weeks, your baby is about the size of an apple. They’re starting to get more flexible and can even do somersaults inside the womb, though you may not feel it just yet.

• Length: 10.1 cm
• Weight: 70 grams

Size of Baby at 16 Weeks?

At 16 weeks, your baby is the size of an avocado. They're growing quickly now, and their little body is taking shape with developing muscles and bones.

• Length: 11.6 cm
• Weight: 100 grams

Size of Baby at 17 Weeks?

By 17 weeks, your baby is about the size of a turnip. While growth might not be drastic in the past week, they're still getting stronger and more defined as they prepare for bigger growth in the upcoming weeks.

• Length: 13 cm
• Weight: 140 grams

Size of Baby at 18 Weeks?

At 18 weeks, your baby is roughly the size of a capsicum. By now, your baby has their own unique fingerprints, and their genitalia has fully formed. Development is progressing rapidly.

• Length: 14.2 cm
• Weight: 190 grams

Size of Baby at 19 Weeks

By 19 weeks, your baby is about the size of an heirloom tomato. You may start feeling gentle movements like prods and jabs, especially if this isn't your first pregnancy. It's an exciting time as you connect with your growing baby.

• Length: 15.3 cm
• Weight: 240 grams

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Size of Baby at 20 Weeks?

Now we’re really getting the fruit salad going! Your bub’s fruit size at 20 weeks is (drumroll please…) a banana (16.4 cm; 300 g). A banana that may be starting to sprout some thin eyebrows and a little hair on their head, but a banana all the same. From about 20 weeks, your baby is measured from head to heel (25.6 cm), rather than from the bottom, as their legs unfurl from their tucked-in position.

• Length: 16.4 cm
• Weight: 300 g

Size of Baby at 21 Weeks?

Things don’t change too drastically size-wise at 21 weeks, when your baby is around the length of a carrot (26.7 cm; 360 g). It’s around this time that they’ll start responding to touch, too – put a little pressure on your belly and they may move away or even push back!

• Length: 26.7 cm
• Weight: 360 g

Size of Baby at 22 Weeks?

‘What size fruit is my baby at 22 weeks?’ you ask. A 22-week-old foetus is about the same size as a Lebanese cucumber (27.8 cm; 430 g). At 22 weeks pregnant (in months, that’s about 6), baby is starting to produce the protein that will help them breathe on their own once they arrive earthside. They grow up so fast!

• Length: 27.8 cm
• Weight: 430 g

Size of Baby at 23 Weeks?

At around 500 g now, your baby-fruit size comparison at 23 weeks is a mango (28.9 cm), and there’s so much other cool stuff going on at this time, too. Baby is starting to hear more and even recognise your voice!

• Length: 28.9 cm
• Weight: 500 g

Size of Baby at 24 Weeks?

With a big jump in weight to 600 g, your 24-week-old foetus is officially around the size of an ear of corn (30 cm), and they’re already practising breathing! (Although right now, they’re inhaling amniotic fluid, not air. Don’t worry, it’s what they’re meant to do!)

• Length: 30 cm
• Weight: 600 g

Size of Baby at 25 Weeks?

At 25 weeks, your baby’s size is roughly around that of an average swede (34.6 cm; 660 g). They’re learning to be cheeky right now, too, by sticking out their tongue.

• Length: 34.6 cm
• Weight: 660 g

Size of Baby at 26 Weeks?

At 26 weeks, your baby’s size is now similar to a red cabbage, with another 100 g leap (35.6 cm; 760 g)! Their hair is growing, they’re responding more to sound… it’s all happening!

• Length: 35.6 cm
• Weight: 760 g

Size of Baby at 27 Weeks?

Things are really ramping up by week 27, as your baby grows to about the size of a cauliflower (36.6 cm; 875 g). They may also be able to distinguish between your and your partner’s voice – so clever.

• Length: 36.6 cm
• Weight: 875 g

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Size of Baby at 28 Weeks?

You’re in your 7th month and wondering, ‘How big is my baby now?’ Don’t freak out, but you’ve got a tot the size of a large eggplant in there at around 1 kg (37.6 cm)! They’re beginning to open and close their eyes at this stage.

• Length: 37.6 cm
• Weight: 1 kg

Size of Baby at 29 Weeks?

Staying in the squash family, by 29 weeks, your bub is about the same size as a butternut pumpkin (38.6 cm; 1.2 kg) – and from now until birth, their brain will triple in weight.

• Length: 38.6 cm
• Weight: 1.2 kg

Size of Baby at 30 Weeks?

When it comes to the size of baby at 30 weeks, fruit takes a back seat once again – this time it’s a decent-sized cabbage taking centre stage (39.9 cm; 1.3 kg). Bub is also starting to take naps, cycling between sleeping and waking.

• Length: 39.9 cm
• Weight: 1.3 kg

By week 30, you might start to notice some lower back discomfort. A pregnancy belt can help support your bump and ease lower back pain.

Size of Baby at 31 Weeks?

In your 7th month, your bub is starting to grow at a rate of around 250 g a week… and your ‘baby fruit’ is now a 1.5 kg coconut (41.1 cm)!

• Length: 41.1 cm
• Weight: 1.5 kg

Size of Baby at 32 Weeks?

At 32 weeks, you’re likely wondering, ‘How big is my baby now?’ The answer: bub is as long as a bunch of celery (42.4 cm) and weighs about 1.7 kg. Watch what you eat now – bub’s taste buds have developed and they may just get a taste for what you nosh on!

• Length: 42.4 cm
• Weight: 1.7 kg

Size of Baby at 33 Weeks?

Pineapple is the perfect baby fruit size comparison at the 33-week mark (43.7 cm; 1.9 kg). Meanwhile, your baby is beginning to plump up and their skin is becoming less wrinkled as they get closer to making their grand entrance.

• Length: 43.7 cm
• Weight: 1.9 kg

Size of Baby at 34 Weeks?

Things are getting bigger… Your 34-week baby fruit marker is a rockmelon (45 cm; 2.1 kg). Tip: Try singing a favourite lullaby to your bump at this stage – research shows they’re more likely to be comforted by that same song after birth!

• Length: 45 cm
• Weight: 2.1 kg

Size of Baby at 35 Weeks?

Hey, honey! At 35 weeks, your baby is the size of a honeydew melon (46.2 cm; 2.4 kg), and you might’ve noticed that space is getting tight in there as bub’s twists and turns may become a little uncomfortable.

• Length: 46.2 cm
• Weight: 2.4 kg

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Size of Baby at 36 Weeks?

A large cos lettuce will give you a good idea of baby’s size by week 36 (47.4 cm; 2.6 kg). At the end of this week, you’re considered full-term – your new arrival could come any day!

• Length: 47.4 cm
• Weight: 2.6 kg

Size of Baby at 37 Weeks?

Your bub is as long as a stalk of Swiss chard (48.6 cm) – though a bit heavier, at around 2.9 kg! With an increase in their hearing sensitivity, baby may start to hone their startle reflexes at this time, too.

• Length: 48.6 cm
• Weight: 2.9 kg

Size of Baby at 38 Weeks?

You’re in the home stretch now! Your baby is as long as a leek this week (49.8 cm; 3 kg), and can grasp with their hands. Connections are still forming in their brain as they get ready to join the world.

• Length: 49.8 cm
• Weight: 3 kg

Size of Baby at 39 Weeks?

If it feels like you’re carrying around a mini watermelon in there, you’re not wrong – weighing in at 3.3 kg, this is your baby’s fruit size at 39 weeks (50.7 cm).

• Length: 50.7 cm
• Weight: 3.3 kg

Size of Baby at 40 Weeks?

If baby is still hanging out in your womb at week 40, they’ll be about the size of a small pumpkin (51.2 cm; 3.3 kg). But don’t stress if they stay inside a little longer than you’re expecting – many first babies are late.

• Length: 51.2 cm
• Weight: 3.3 kg

Looking for more information on how to best welcome your baby into the world? Our guide to the rituals to prepare for labour offers proven techniques to help you experience a smoother, more comfortable motherhood journey.

Download your copy of our baby size chart here!