How Big is My Baby Now?

How Big is My Baby Now? Female obstetrician gynecologist measuring belly size of pregnant woman with measuring tape

Pregnancy is an awe-inspiring journey filled with anticipation and wonder. As an expectant parent, you’re undoubtedly eager to keep track of your baby’s growth and development. One common question that arises during this miraculous time is, “How big is my baby now?” This guide aims to provide you with the answers, allowing you to marvel at the incredible progress your little one is making each week.

How Big is My Baby Now? The Seed of Life Begins

1st trimester - How Big is My Baby Now?

As your journey begins, you might be eager to know just how big your baby is at this early stage. Let’s delve into the growth milestones you can expect during the initial weeks of pregnancy.

Week 4: A Tiny Seed Takes Root

At four weeks, your baby is just a tiny seed, about the size of a poppy seed. It’s amazing to think that this minuscule speck holds the potential for an entire human being!

Week 8: Growing Steadily

By the eighth week, your baby has grown to about the size of a raspberry. Though still tiny, their growth is steady and remarkable.

Week 12: A Plum-sized Miracle

At 12 weeks, your baby is approximately the size of a plum. The rapid development of their organs and features is truly astonishing.

How Big is My Baby Now? The Rapid Growth Begins

2nd trimester - How Big is My Baby Now?

As your pregnancy progresses, you’ll notice significant changes in your baby’s size. Let’s explore the fascinating growth milestones from week 13 to week 27

Week 16: A Sweet Avocado

By week 16, your baby has grown to the size of a delicious avocado. As you feel their movements, you can’t help but marvel at their growing presence.

Week 20: A Banana Takes Shape

At the halfway mark of your pregnancy, your baby is now as big as a banana. Their tiny limbs are becoming stronger, and their unique personality is beginning to form.

Week 24: An Ear of Corn

At 24 weeks of pregnancy, your baby is about the size of an ear of corn, marking a significant growth milestone in their development. It’s amazing to see how far they’ve come from a tiny seed to their current size.

How Big is My Baby Now? The Final Stages of Growth

3rd trimester - How Big is My Baby Now?

The final trimester of pregnancy brings remarkable growth and preparation for the outside world. Let’s explore the wonders of your baby’s size from week 28 until the end of pregnancy.

Week 28: A Tasty Eggplant

By week 28, your baby has reached the size of a delicious eggplant. They are growing plumper and are now more responsive to external stimuli.

Week 32: A Crunchy Jicama

At 32 weeks of pregnancy, your baby is approximately the size of a jicama and undergoing significant developments. Their bones are hardening, muscles are strengthening, and their senses are becoming more refined as they prepare for life outside the womb.

Week 36: A Head of Lettuce

At 36 weeks of pregnancy, your baby is about the size of a head of lettuce. They are rapidly developing and gaining body fat to support them outside the womb.

Pregnancy: Baby Growth Chart

During your pregnancy, your baby will continue to grow and develop. You may have thoughts like how big is my baby now? This chart will provide you with a broad notion of your baby’s size throughout the course of your pregnancy.

This chart is only for informational reasons. You can get the most precise measurement of your baby from your midwife. There are two methods for determining your baby’s size:

  • This is known as measuring the fundal height, and it involves measuring the size of your bump. To ensure that your baby’s growth is appropriate for your stage of pregnancy, they will take measurements from your pubic bone to the top of your uterus.
  • When you have an ultrasound scan, such as your 12-week dating scan or a growth scan if your midwife deems it essential, the size of your unborn child can also be measured.

Week 40.036 – 0.10 cmup to 0.04 in< 0.04 oz
Week 50.13 cm0.05 n< 0.04 oz
Week 60.32 cm0.13 in< 0.04 oz
Week 71.27 cm0.5 in< 0.04 oz
From 8 – 19 weeks your baby’s measurement is from crown to rump
Week 81.60 cm1 g0.63 in0.04 oz
Week 92.30 cm2 g1.22 in0.07 oz
Week 103.10 cm4 g1.22 in0.14 oz
Week 114.10 cm7 g1.61 in0.25 oz
Week 125.40 cm14 g2.13 in0.49 oz
Week 137.40 cm23 g2.91 in0.81 oz
Week 148.70 cm43 g3.42 in1.52 oz
Week 1510.10 cm70 g3.98 in2.47 oz
Week 1611.16 cm 100 g4.57 in3.53 oz
Week 1713.00 cm140 g5.12 in4.94 oz
Week 1814.20 cm190 g5.59 in6.70 oz
Week 1915.30 cm240 g6.02 in8.47 oz
From 20 weeks your baby’s measurement is from crown to heel
Week 2025.60 cm300 g10.08 in10.58 oz
Week 2126.70 cm360 g10.51 in12.70 oz
Week 2227.80 cm430 g10.94 in15.17 oz
Week 2328.90 cm501 g11.38 in1.10 lb
Week 2430.00 cm600 g11.81 in1.32 lb
Week 2534.60 cm660 g13.62 in1.46 lb
Week 2635.60 cm760 g14.02 in1.68 lb
Week 2736.60 cm875 g14.41 in1.93 lb
Week 2837.60 cm1005 g14.80 in2.22 lb
Week 2938.60 cm1153 g15.20 in2.54 lb
Week 3039.90 cm1319 g15.71 in2.91 lb
Week 3141.10 cm1502 g16.18 in3.31 lb
Week 3242.40 cm1702 g16.69 in3.75 lb
Week 3343.70 cm1918 g17.20 in4.23 lb
Week 3445.00 cm2146 g17.72 in4.73 lb
Week 3546.20 cm2383 g18.19 in5.25 lb
Week 3647.40 cm2622 g18.66 in5.78 lb
Week 3748.60 cm2859 g19.13 in6.30 lb
Week 3849.80 cm3083 g19.61 in6.80 lb
Week 3950.70 cm3288 g19.96 in7.25 lb
Week 4051.20 cm3462 g20.16 in7.63 lb

While you undoubtedly can’t wait to meet your kid, cherish every month of your pregnancy since each step of their development is something to be proud of.

Related: How to Keep Pregnant Women Away From Acid Reflux Dilemma


Throughout your pregnancy, the question “How big is my baby now?” will be on your mind. As you’ve learned, your baby grows from a tiny seed to a fully formed miracle. Each week brings new milestones and marvels as their size increases. Embrace the journey, celebrate the growth, and cherish the anticipation of meeting your little one.

In this guide, we’ve covered the remarkable growth stages from the early weeks to the final trimester. Remember, your baby’s size is just one aspect of their journey. Regular check-ups, a healthy lifestyle, and open communication with your healthcare provider are essential for ensuring their well-being.

So, take a moment to marvel at the wonder of life, knowing that your baby is growing steadily and preparing for their grand entrance into the world. And remember, the question “How big is my baby now?” is not just about size but about the immeasurable love and joy they will bring to your life.

Frequently Asked Questions (FAQs)

How does my Baby’s size affect my pregnancy?

Your baby’s size plays a significant role in your pregnancy journey. As they grow, they may put pressure on your organs, causing discomfort. It’s essential to monitor their growth through regular check-ups with your healthcare provider.

Can my Baby’s size be determined through ultrasound?

Ultrasounds are a valuable tool for estimating your baby’s size during pregnancy. While ultrasounds can provide approximate measurements, it’s important to remember that these measurements are estimates and can vary. Your healthcare provider will be able to give you a better understanding of your baby’s size based on their expertise and the information gathered from ultrasounds.

What factors can influence my Baby’s size?

Several factors can influence your baby’s size, including genetics, maternal health, and nutrition. It’s important to maintain a healthy lifestyle, eat a balanced diet, and attend prenatal appointments to ensure optimal growth and development for your baby.

Can my Baby’s size indicate their overall health?

While your baby’s size can provide some insights into their growth, it’s important to note that size alone does not determine their overall health. Your healthcare provider will monitor various factors, including fetal movements, heartbeat, and development of organs, to assess your baby’s well-being.

Can I track my Baby’s growth at home?

While it may not be possible to measure your baby’s size accurately at home, you can still keep track of their growth through various milestones and changes. Pay attention to their movements, seek regular prenatal care, and discuss any concerns with your healthcare provider.

Will my Baby’s size at birth be an indication of their future growth?

The size of your baby at birth does not necessarily indicate their future growth or potential. Babies grow and develop at different rates, and their size at birth is influenced by various factors. Remember that every child’s journey is unique, and their growth trajectory will be determined by a combination of genetics, nutrition, and overall health.

Disclaimer: Affiliate links used. We may earn a commission (at no cost to you) if you make a purchase.

Hi, I'm Sushil Singh, a devoted dad and guiding voice in the transformative journey of parenting, based in Mumbai. Drawing from a decade of firsthand experience and extensive research, I offer authentic insights into prepartum, pregnancy, and postpartum stages at Pregnancy Boss. From joyous milestones to challenging uncertainties, my mission is to provide reliable support and practical advice, helping you navigate this profound journey with confidence. Let's embrace the beauty and complexities of parenthood together. Connect for guidance or shared stories. Cheers to our shared path! 🥂 Social Medial Profiles: Quora Pinterest Twitter Facebook

Leave a Comment