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Your baby is constantly growing. This chart should be used to give you a general idea of how big your baby is at different stages during your pregnancy. You will be given a more accurate measurement when you go for your 12 and 20 week scans.

Your midwife will measure your fundal height (basically the size of your bump, from your pubic bone to the top of your uterus) to make sure your baby’s growth is on track.

PREGNANCY / WEEK BABY’S LENGTH / CM BABY’S WEIGHT / G BABY’S LENGTH / IN BABY’S WEIGHT / OZ
Week 4 0.036 – 0.10 cm up to 0.04 in < 0.04 oz
Week 5 0.13 cm 0.05 n < 0.04 oz
Week 6 0.32 cm 0.13 in < 0.04 oz
Week 7 1.27 cm 0.5 in < 0.04 oz
From 8 – 19 weeks your baby’s measurement is from crown to rump
Week 8 1.60 cm 1 g 0.63 in 0.04 oz
Week 9 2.30 cm 2 g 1.22 in 0.07 oz
Week 10 3.10 cm 4 g 1.22 in 0.14 oz
Week 11 4.10 cm 7 g 1.61 in 0.25 oz
Week 12 5.40 cm 14 g 2.13 in 0.49 oz
Week 13 7.40 cm 23 g 2.91 in 0.81 oz
Week 14 8.70 cm 43 g 3.42 in 1.52 oz
Week 15 10.10 cm 70 g 3.98 in 2.47 oz
Week 16 11.16 cm  100 g 4.57 in 3.53 oz
Week 17 13.00 cm 140 g 5.12 in 4.94 oz
Week 18 14.20 cm 190 g 5.59 in 6.70 oz
Week 19 15.30 cm 240 g 6.02 in 8.47 oz
From 20 weeks your baby’s measurement is from crown to heel
Week 20 25.60 cm 300 g 10.08 in 10.58 oz
Week 21 26.70 cm 360 g 10.51 in 12.70 oz
Week 22 27.80 cm 430 g 10.94 in 15.17 oz
Week 23 28.90 cm 501 g 11.38 in 1.10 lb
Week 24 30.00 cm 600 g 11.81 in 1.32 lb
Week 25 34.60 cm 660 g 13.62 in 1.46 lb
Week 26 35.60 cm 760 g 14.02 in 1.68 lb
Week 27 36.60 cm 875 g 14.41 in 1.93 lb
Week 28 37.60 cm 1005 g 14.80 in 2.22 lb
Week 29 38.60 cm 1153 g 15.20 in 2.54 lb
Week 30 39.90 cm 1319 g 15.71 in 2.91 lb
Week 31 41.10 cm 1502 g 16.18 in 3.31 lb
Week 32 42.40 cm 1702 g 16.69 in 3.75 lb
Week 33 43.70 cm 1918 g 17.20 in 4.23 lb
Week 34 45.00 cm 2146 g 17.72 in 4.73 lb
Week 35 46.20 cm 2383 g 18.19 in 5.25 lb
Week 36 47.40 cm 2622 g 18.66 in 5.78 lb
Week 37 48.60 cm 2859 g 19.13 in 6.30 lb
Week 38 49.80 cm 3083 g 19.61 in 6.80 lb
Week 39 50.70 cm 3288 g 19.96 in 7.25 lb
Week 40 51.20 cm 3462 g 20.16 in 7.63 lb

 

Digital and group antenatal courses

We have a number of different antenatal courses available to help you prepare for labour, birth and your baby’s arrival. The courses are practical and evidence-based. They’re taught by practising midwives and will give you the knowledge and tools to approach birth and parenting with confidence. Find out more via the links below: 

£45
Photo of dad changing baby's nappy

Preparing for your baby’s arrival

This course will prepare you for the early days with your newborn as you transition into parenthood, including feeding and newborn care.

£45

Preparing for labour and birth

This course gives you the knowledge, tools and coping strategies to approach labour and birth with confidence.

£80

Preparing for labour, birth and parenting

A comprehensive evidence-based antenatal course taught by midwives and packed with practical tips.

£40

Pregnancy Wellbeing Toolkit

Go from tired and stressed to feeling your best with our Pregnancy Wellbeing Toolkit.

£295

Antenatal Resources

A wide range of videos, digital resources and articles for our group antenatal classes taught by midwives in Bristol and Bath.

FREE

Free Antenatal Course

Practical tips to help you get ready for the last stages of pregnancy, childbirth and parenthood.