At 30 weeks pregnant, your baby weighs approximately 3 lbs (1.36 kg), measures around 15.7 inches (39.87 cm) from head to toe, and is developing rapidly — with a brain forming characteristic wrinkles and grooves, maturing eyes capable of tracking light, and lungs nearing full development. Between 10% and 20% of pregnant women experience depression or anxiety during pregnancy, and up to 70.8% may face at least one notable mood episode, making it critical to seek support from a caregiver rather than stay silent. Physically, pregnancy hormones are loosening joints and pelvic muscles in preparation for birth, which can also cause heartburn, clumsiness, and fatigue as the uterus expands and weight gain reaches roughly 1 lb per week. Supporting the baby's rapidly developing brain through nutrition — including omega-3-rich foods like salmon, walnuts, and fortified cereals containing choline and folic acid — is especially important at this stage.
- Between 10% and 20% of women experience depression or anxiety during pregnancy.
- Up to 70.8% of pregnant women will experience one notable mood episode during pregnancy.
- At week 30, a baby weighs around 3 lbs (1.36 kg) and measures approximately 15.7 inches (39.87 cm) from head to toe.
- A newborn's vision at birth is 20/400, allowing sight only 20 to 30 cm away, compared to the adult standard of 20/20.
- A child with normal vision will not reach 20/20 visual acuity until age eight.
- At week 30, a baby is surrounded by approximately one litre of amniotic fluid.
- Pregnant women gain around 1 lb per week at this stage to support the baby's development.
Pregnancy Diary Week 30
Discover your pregnancy journey
Pregnancy Diary Week 30
Did you know that between 10% to 20% of women battle with depression or anxiety during pregnancy? Don’t feel alone if this is true for you, tell your caregiver and trust people close to you that will support you during this time. This experience varies depending on the person, some women, up to 70.8% of pregnant ladies, will experience one notable mood episode. The biggest mistake you can make is not seeking support as this could exacerbate the situation.
By pregnancy week 30 you may be starting to think more about the birth, as you can now see the light at the end of the tunnel – so can baby! Remember every pregnancy is different, and if you are feeling pretty good considering the changes and extra weight you are now supporting, that is great.
Discover
How your baby is growing
What you can expect at this time
A beneficial food for your pregnancy nutrition
Pregnancy Diary Week 30: How Is Your Baby Growing?
Baby is now weighing in around 3 lbs (1.36 kg) and from head to toe is around 15.7 inches (39.87 cm) in length. From now on you can expect baby to increase by around half a pound each week. Baby’s digestive tract and lungs are very close to full development. Her eyes are maturing and by week 30 of pregnancy, baby is able to follow a light source with her eyes. She can see light at the end of the tunnel. When baby is born her vision is 20/400, which means she can see somewhere between 20 and 30cm distance, and she will spend lots of time with her eyes closed.
An adult’s normal vision is 20/20, which a child will only have when she is eight years old if she has normal vision. She could be batting her eyelashes by now and also has her eyebrows! Baby’s brain is growing every day and by now it is taking on characteristics such as wrinkles and grooves. She should now have the ability to regulate her own body heat and this means that she will start shedding her lanugo hair. Surrounded by about a litre of amniotic fluid, baby may be hiccuping at this time, which can feel like little flutters to you.
What you can expect
As pregnancy hormones secrete in your body, your joints will be loosening up. These hormones enable your pelvic muscles to be more relaxed for delivery day. However this relaxing also affects the muscle ring that separates your oesophagus from your stomach, which means you can be experiencing heartburn. This is a common ailment and is made worse as your uterus continues to expand.
The relaxation, added to the concentrated weight gain, which causes a shift in your centre of gravity, is probably making you feel clumsier than you would normally be. In some cases, muscle relaxation can affect the feet, which may even spread permanently. You are gaining around 1lb per week to support baby’s development. With all of this, it is no wonder that you may be feeling a bit tired at the moment.
Brain Food For Pregnancy Nutrition
As baby’s brain continues to develop and you want to support this growth, as well as eating healthily for yourself, here are some ideas of foods that are excellent for brain development.
Healthy Fortified Cereals
Start the day with a fortified cereal. Choose something that you enjoy, but avoid ones that are high in sugar or salt. Wheaties is one good choice, but there are others on the market also. Fortified cereals contain choline and folic acid, as well as numerous micro-nutrients, which are essential for baby’s brain development.
Nuts And Seeds
There are omega-3 fats in both nuts and seeds, as well as other important nutrients for brain development, like vitamin B6. It is easy to add in a handful each day, either on your cereal, or in natural yoghurt, or on top of a salad.
The highest in omega-3 fats are walnuts.
Sea Vegetables
A great way to get folic acid, iodine, omega-3 fatty acids and choline into your system is by eating sea vegetables. There are many seaweeds available, such as nori and in Ireland, we have our own varieties. However, the one you shouldn’t eat is hijiki, which is a brown sea vegetable which contains a good bit of arsenic.
Fruit And Vegetables
Fruit and vegetables are part of any healthy diet, containing lots of nourishment and vitamins. Leafy greens, sweet potatoes and carrots are helpful for both brain development and for eyesight.
Foods With Zinc
Zinc plays an important part in the development of your baby’s brain. You can find zinc in toasted pumpkin seeds, wheat germ, tahini, peanuts and chocolate. Fish Some fish are high in mercury, so although these should be avoided, there are other fish that are very helpful for your baby’s brain development. Ideally, you should these fish once or twice each week.
Some of the beneficial fish are: Salmon, Tuna, Herring and Trout
Pregnancy Diary Week 30
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DISCLAIMER
All articles on the blog and website are intended as information only. Please do not consider any of the information provided here as a substitute for medical advice. At all times seek medical advice directly with your own doctor and medical team.
ANNOUNCEMENT
This website was formerly Merrion Fetal Health. The clinic has undergone a rebrand and is now known as Merrion Ultrasound.
How big is a baby at 30 weeks pregnant?
At 30 weeks, a baby weighs around 3 lbs (1.36 kg) and measures approximately 15.7 inches (39.87 cm) from head to toe. From this point, babies typically gain around half a pound each week.
What can a baby see at 30 weeks gestation?
By week 30, a baby can follow a light source with her eyes. When born, her vision will be 20/400, meaning she can see only 20 to 30 cm away — normal adult vision of 20/20 is not reached until around age eight.
What causes heartburn during pregnancy at 30 weeks?
Pregnancy hormones loosen the muscle ring separating the oesophagus from the stomach, which allows stomach acid to rise and causes heartburn. This is made worse as the uterus continues to expand.
What are the best brain foods to eat during pregnancy?
Foods that support fetal brain development include fortified cereals containing choline and folic acid, walnuts (the highest source of omega-3 fats among nuts and seeds), sea vegetables like nori, leafy greens, sweet potatoes, and fish such as salmon, tuna, herring, and trout eaten once or twice a week.
Which seaweed should pregnant women avoid?
Pregnant women should avoid hijiki, a brown sea vegetable that contains a significant amount of arsenic. Other seaweeds such as nori are considered safe and beneficial sources of folic acid, iodine, omega-3 fatty acids, and choline.
What foods contain zinc for fetal brain development?
Zinc, which plays an important role in fetal brain development, can be found in toasted pumpkin seeds, wheat germ, tahini, peanuts, and chocolate.
How common is depression and anxiety during pregnancy?
Between 10% and 20% of women experience depression or anxiety during pregnancy. Up to 70.8% of pregnant women may experience at least one notable mood episode, making it important to seek support from a caregiver or trusted person.
Why do pregnant women feel clumsier in the third trimester?
Pregnancy hormones cause joints and muscles to relax in preparation for delivery, while concentrated weight gain shifts the body's centre of gravity. Together, these changes make many women feel clumsier than usual around week 30.