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Originally published March 23, 2020 · Last updated August 20, 2026

Pregnancy Diary Week 12

Discover your pregnancy journey

Pregnancy Diary Week 12

The first trimester of your pregnancy is about to end, and your baby’s development since conception is nothing short of an amazing miracle. By next week, you will be into the second trimester of your pregnancy and you should expect more substantial changes to come. For now, let’s focus on the changes that are happening this week.

Discover

How your baby is growing

What you can expect  at this time

A beneficial food for your pregnancy nutrition

 

Pregnancy Diary Week 12: How Is Your Baby Growing?

By this time, your baby is now as large as a big plum or a lime. His entire foetal system is now becoming functional while his bone marrow is now starting to produce white blood cells. The baby’s pituitary gland which is found at the base of the brain now starts producing hormones.

The baby’s mouth is now making sucking movements, his toes begin to curl, and his fingers begin to open and close. Almost all of the organs and structures in the baby’s body have now formed and as days pass by, they will continue to develop and become more functional. It weighs almost 14 grams with a length of 3 ½ inches. The placenta is now very active in producing hormones which reduce your risk for miscarriage. By the end of this week, a nuchal translucency scan can now be administered.

 

What you can expect

As the days and weeks go by, your pregnancy symptoms are most likely getting more intense, although the need to urinate has reduced by now. Fatigue, flatulence, excessive saliva, increased vaginal discharge, occasional dizziness and increased smell sensitivity are still present during this week

By this week, heartburn is more likely to occur. Also known as acid indigestion, heartburn is a burning sensation which normally extends from the lower throat to the bottom of the breastbone.

Cabbage For Pregnancy Nutrition

Pregnant women are often advised to take a sufficient amount of fresh fruits and vegetables daily. Fresh produce gives ample amount of vitamins, minerals and nutrients which are very beneficial to both the mother and the baby. Cabbage is one of the highly recommended vegetables for pregnant women. Aside from its cholesterol-lowering effects, cabbage is known for its anti-cancer properties.

This cruciferous vegetable contains special compounds that are beneficial in promoting heart health. It even helps in enhancing the functions of the digestive tract and in treating stomach ulcer or peptic ulcer. This vegetable is also rich in sinigrin compound which is known to be effective at preventing the onset of certain types of cancer including colon, prostate and bladder cancer.

Cabbage contains antioxidant properties through its Vitamin C, polyphenol and anthocyanin contents and anti-inflammatory effects. According to research, insufficient intake of antioxidants can compromise oxygen metabolism and increase metabolic stress which can lead to cancer. This cruciferous vegetable is actually an excellent source of Vitamin B1, calcium, potassium, tryptophan, fibre, molybdenum, manganese, Vitamin B6, Vitamin K and folate. Cabbage provides 30 mg of folic acid which is very important in pregnant women. In this crucial period, pregnant women need to have at least 800 mg of folic acid every day.

Folic acid is exceptionally essential in preventing the onset of neural tube defects such as spina bifida. Meanwhile, its fibre content plays a vital role in preventing constipation which is a normal complaint in pregnant women during pregnancy. The fibre in cabbage promotes better digestive health and in increasing bowel movement during pregnancy. It also improves the overall metabolism and digestion in pregnant women. According to recent research, children born to mothers who take sufficient amount of cruciferous vegetables, such as cabbage, during their pregnancy have a reduced risk for lung cancer during their adult year and reduced susceptibility to lymphoma and leukaemia in their childhood.

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Quick Overview:

Week 12 marks the final days of the first trimester, when a baby weighs approximately 14 grams, measures 3½ inches in length, and has nearly all major organs formed and becoming functional. The placenta is now actively producing hormones that reduce miscarriage risk, bone marrow has begun producing white blood cells, and the pituitary gland is secreting its first hormones. A nuchal translucency scan becomes available by the end of this week, while mothers can expect ongoing symptoms including heartburn, fatigue, and increased vaginal discharge. Nutritionally, cabbage is highlighted as a valuable food at this stage, supplying folate, Vitamin K, fibre, and antioxidants — with pregnant women requiring at least 800 mg of folic acid daily to help prevent neural tube defects such as spina bifida.

Key Takeaways
  • At week 12, the baby weighs almost 14 grams and measures 3½ inches in length.
  • By the end of week 12, a nuchal translucency scan can be administered.
  • The baby's bone marrow begins producing white blood cells by week 12 of pregnancy.
  • The baby's pituitary gland, located at the base of the brain, starts producing hormones at week 12.
  • Cabbage provides 30 mg of folic acid, a nutrient essential for preventing neural tube defects such as spina bifida.
  • Pregnant women are advised to consume at least 800 mg of folic acid every day during this crucial period.
  • Cabbage contains sinigrin, a compound linked to the prevention of colon, prostate, and bladder cancer.

Pregnancy Diary Week 12

Select a Week of the Pregnancy Diary to start viewing information specific to each week

 

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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 12 weeks pregnant?

At 12 weeks, the baby is approximately the size of a large plum or lime, measuring 3½ inches in length and weighing almost 14 grams.

What is a nuchal translucency scan and when is it performed?

A nuchal translucency scan is a prenatal ultrasound that can be administered from the end of week 12 of pregnancy. It is used to assess the baby's development during the first trimester.

What symptoms should I expect at 12 weeks pregnant?

At 12 weeks, common symptoms include fatigue, flatulence, excessive saliva, increased vaginal discharge, occasional dizziness, and increased smell sensitivity. Heartburn also becomes more likely to occur at this stage.

What is heartburn during pregnancy?

Heartburn, also known as acid indigestion, is a burning sensation that normally extends from the lower throat to the bottom of the breastbone. It becomes more likely to occur by week 12 of pregnancy.

Why is cabbage recommended during pregnancy?

Cabbage is recommended during pregnancy because it is rich in folate, Vitamin K, Vitamin B6, calcium, potassium, and fibre, all of which support both maternal and fetal health. Its fibre content also helps prevent constipation, a common complaint during pregnancy.

How much folic acid does cabbage provide and how much do pregnant women need?

Cabbage provides 30 mg of folic acid per serving, while pregnant women need at least 800 mg of folic acid daily. Folic acid is essential for preventing neural tube defects such as spina bifida.

What neural tube defects can folic acid help prevent during pregnancy?

Folic acid is essential in preventing the onset of neural tube defects such as spina bifida. Pregnant women are advised to ensure sufficient daily intake of folic acid to reduce this risk.

What is happening with the baby's development at 12 weeks pregnant?

By week 12, almost all of the baby's organs and structures have formed, the bone marrow is beginning to produce white blood cells, and the pituitary gland has started producing hormones. The baby's mouth is making sucking movements, and its fingers are beginning to open and close.

What role does the placenta play at 12 weeks of pregnancy?

By week 12, the placenta is very active in producing hormones that help reduce the risk of miscarriage. It plays a critical role in supporting the baby's continued development into the second trimester.

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