Dos and Don’ts During the First Trimester of Pregnancy

Learn the essential dos and don’ts during the first trimester to support a healthy pregnancy and make early pregnancy more comfortable.
Medically Reviewed By
Dr. Sabiha Anjum (Gynecologist/Obstetrician)
Expert Validated
This health content has been medically reviewed by qualified experts and follows the FirstCry Parenting editorial policy to ensure accuracy and reliability.

The first trimester can leave you wondering if you’re doing everything right. What should you eat? Can you exercise? What should you avoid? And is every little change in your body normal? With pregnancy advice coming from friends, family, and the internet, it’s easy to feel overwhelmed by what you should and shouldn’t do.

But you don’t have to figure it all out on your own. Regular prenatal care can help you get the right guidance from the start. WHO recommends your first antenatal check-up within the first 12 weeks of pregnancy, with at least eight check-ups throughout pregnancy (1). Along with regular check-ups, knowing the right foods to eat, activities to follow, and habits to avoid can help you take better care of yourself and your growing baby. Let’s look at the key first-trimester do’s and don’ts to keep in mind during these early weeks.

Why Is the First Trimester Critical?

The first trimester is a crucial stage because your baby’s major organs begin to form, while your body starts adapting to pregnancy. Here’s a closer look at what makes these early weeks so important:

1. Major Development Begins

During the first trimester, your baby’s basic body structures and major organs begin to develop. The brain, spinal cord, heart, and other organs start forming, making this a sensitive stage of pregnancy (2).

2. The Placenta Starts to Develop

The placenta begins developing early in pregnancy and helps provide your baby with oxygen and nutrients. It also helps remove waste and produces hormones that support the pregnancy (3).

3. Early Pregnancy Symptoms Appear

Hormonal changes can cause common symptoms such as nausea, tiredness, breast tenderness, frequent urination, and mood changes. While these symptoms can be uncomfortable, they are often a normal part of early pregnancy (4).

4. The Risk of Pregnancy Loss Is Higher

The risk of miscarriage is highest during the first trimester. Many early pregnancy losses happen because of problems with the baby’s chromosomes and are not caused by something the mother did (5).

Do’s and Don’ts During First Trimester

Here are some things you should do and avoid in 1st trimester of pregnancy. Trust us, these 1st trimester of pregnancy do’s and don’ts will help you have a healthy pregnancy.

Do’s in First Trimester

Small, healthy habits can make a big difference during the early weeks of pregnancy. Here are some important do’s to keep in mind:

1. Take Folic Acid Supplements

Start taking folic acid as soon as possible after you know you’re pregnant, or ideally before conception, as advised by your doctor. Folic acid helps your baby’s brain and spinal cord develop properly and reduces the risk of neural tube defects. Take the recommended dose regularly and do not increase it without speaking to your doctor. You can also get folate from foods such as leafy green vegetables, beans, peas, citrus fruits, and fortified grains (6).

2. Limit Your Caffeine Intake

If you are a coffee person, the thought of giving it up completely can make you sick, but here’s a piece of good news for you: you don’t have to give it up cold turkey or at all – you can still enjoy a cup of coffee while pregnant, but make sure that you stick to just 1 cup. Taking too much caffeine can also lead to premature births and may cause birth defects. Stick to 1 cup, i.e., less than 200 mg of caffeine a day, and you and your baby should be fine (7). The best option would be consulting a doctor regarding the amount of caffeine that safe for consumption during pregnancy and playing it safe!

3. Take Herbal Supplements and Painkillers With Caution

Painkillers and herbal supplements must be taken with caution. Your doctor will prescribe you certain medicines, and if you’re taking supplements or are on medication, you must consult her since these may interact with your existing medicines. Furthermore, overuse of painkillers can be harmful for the health of the foetus as certain chemicals may pass through the placenta into the bloodstream.

4. Stop Eating Unhealthy Foods

If you are already within the healthy weight range, you will probably need to up your calorie intake by at least 300 during the first trimester of your pregnancy and be expected to pack on 1 pound (0.4 kg) a week during each week of your first trimester. However, make sure you have a balanced diet and avoid unhealthy foods.

5. Stay Physically Active

If your pregnancy is uncomplicated and your doctor has not advised otherwise, staying active can be beneficial. Walking, swimming, and other pregnancy-safe activities can help you stay fit and may also improve your mood and energy levels (8).

6. Stay Hydrated

Drink enough water throughout the day, especially if you are dealing with vomiting or nausea. Keeping fluids nearby and taking small, frequent sips can make it easier to stay hydrated.

7. Keep Up With Prenatal Check-Ups

Start prenatal care early and attend your scheduled appointments. These visits allow your doctor to monitor your health and your baby’s development, recommend necessary tests and supplements, and address any concerns you may have.

Don’ts in First Trimester

Knowing what to avoid is just as important as knowing what to do during early pregnancy. A few simple precautions can help reduce avoidable risks and protect your health and your growing baby.

1. Avoid Smoking

If you are pregnant and smoke, it’s time to quit. Smoking during pregnancy can increase the chances of miscarriage, premature labour, and ectopic pregnancy. The smoke inhaled can hamper the development of the foetus and ruin your chances of a healthy delivery. So say ‘no’ to cigars and embrace tobacco-free living if you want a healthy pregnancy (9).

2. Say ‘No’ to Alcohol

There is no study to prove that a specific quantity of alcohol is safe during pregnancy, hence it is best avoided. Alcohol is linked to learning disorders and can interfere with the brain development of the foetus. Furthermore, drinking alcohol in the first 12 weeks of pregnancy can also cause miscarriage, so it is best not included in the first trimester of pregnancy diet and perhaps, even later. So steer clear of alcohol while pregnant and have a healthy pregnancy (10).

3. Avoid Sauna and Hot Baths

High temperatures are not good for foetal development. So avoid taking hot showers at all costs. If you have back pain and joint pain, consider using heating pads wrapped in a towel. But do remember that the temperature of the heating pad should not exceed 100°F or 37°C (11).

Consult a doctor before taking herbal supplements and painkillers

4. Avoid Seafood

Although seafood is a healthy source of protein and fats, some fish such as shark, swordfish, and marlin have been known to contain toxic substances and high levels of mercury. Eating these fish during pregnancy can be harmful for the health of the baby. Hence, it is suggested that you avoid seafood during the first trimester of your pregnancy or better yet throughout your pregnancy. However, if you still wish to incorporate fish in your diet, consult a doctor (12).

5. Avoid Processed Foods

Processed foods contain food additives and substances that are harmful to the development of the foetus. Food additives contain sodium nitrate traces and cancer-causing substances which can be harmful to your health as well as your baby’s health. Additionally, pesticides may creep in with such foods, which is why we recommend that you stick to organic sources of foods and avoid processed or packaged food items. And make sure to wash your fruits and vegetables and peel them before eating them.

6. Don’t Eat Raw or Undercooked Foods

Avoid raw or undercooked meat, eggs, seafood, and unpasteurised milk or dairy products, as they can carry germs that may cause foodborne infections. Wash fruits and vegetables well before eating them and keep raw and cooked foods separate (13).

7. Don’t Ignore Warning Signs

Seek medical advice if you experience heavy bleeding, severe abdominal pain, persistent vomiting, fever, dizziness, or any symptom that feels unusual or concerning. When in doubt, it is better to check with your doctor rather than ignore a potential warning sign.

Self Care Tips During First 3 Months of Pregnancy

Here are a few tips and precautions to be taken in first trimester to ensure a healthy transition into the second and third trimesters and to ensure that you have no complications during delivery (14):

  • Load Up on Veggies – Veggies are always healthy, and more so during pregnancy. So while pregnant, increase your intake of vegetables and delicious organic goodies, and make way for a healthy pregnancy.
  • Exercise – Practising yoga and light exercises will keep you healthy during pregnancy. You can start practising yoga and pranayama just to be safe since certain exercises can lead to preterm labour in expecting women. You can also take up some light exercises – these will keep you active and your metabolism working. However, do consult your doctor or healthcare provider before you decide to take up any exercises. And avoid strenuous exercises at all cost!

Pregnant Woman Doing Yoga

  • Take Prenatal Vitamins – Follow up with your doctor regarding the intake of prenatal vitamins. Take the vitamins prescribed by your doctor regularly as they will provide you with necessary nutrients required during the first trimester and also help your baby grow.
  • Talk to Your Doctor If You Are Not Well – If you experience pain or do not feel good after taking certain medications, foods, or supplements, consult with your healthcare provider and stop taking those immediately until you find out what’s wrong and how it’s affecting your well-being. You may be allergic to certain foods or medications, or maybe those medicines might be interacting with your existing medical conditions, so check with your doctor at the earliest.
  • Watch Your Weight – A woman should lead an active lifestyle and have a healthy BMI if she is planning to get pregnant. Obesity poses a risk towards a healthy pregnancy. If you are already pregnant, you can take up light exercises and eat healthily to have a healthy pregnancy. If you gain too much weight during the first trimester and upcoming weeks, you may have complications in pregnancy. So watch your calorie intake; eat calorie-dense foods in less proportion, and consult with your dietitian or nutritionist if needed.
  • Try Natural Remedies – Avoid taking painkillers if the pain is not severe. Try relaxation exercises, meditation, mindfulness, and breathing techniques to feel better. Ask your partner to give you a massage, and sleep in an inclined position, if needed, to relieve back pain, if you have it. Whatever the case, try natural ways or remedies of pain relief rather than taking drugs or artificial substances.

FAQs

1. Can I travel during the first trimester?

In most uncomplicated pregnancies, occasional travel is generally safe. However, if you have bleeding, severe nausea, a high-risk pregnancy, or other complications, speak with your doctor before travelling. On longer journeys, take regular breaks, stay hydrated, and move around when possible.

2. Do I need extra calories during the first trimester?

Usually, you do not need a large increase in calories during the first trimester. Instead, focus on nutritious, balanced meals and follow your doctor’s advice based on your health, weight, and pregnancy needs.

3. Is it safe to sleep on my back during the first trimester?

During the first trimester, you can generally sleep in whichever position feels comfortable. As pregnancy progresses, your doctor may recommend sleeping on your side, particularly later in pregnancy.

During pregnancy, taking the necessary precautions can increase your chances of having a healthy and normal delivery. So eat healthily, avoid stress, be happy, and take care of yourself and your baby.

Also Read: 

First Month of Pregnancy
Common Problems during Pregnancy
Complications in the First Trimester of Pregnancy

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About the Author
Romita Puruswani

Romita Puruswani is a parenting and pregnancy content writer at FirstCry Parenting, India's largest parenting platform. She specialises in evidence-based articles on pregnancy stages, prenatal care, labour and delivery, postnatal recovery, and newborn care. Romita brings both research rigour and reader empathy to every piece she writes, helping millions of Indian parents navigate one of life's biggest journeys with confidence.

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Dr. Sabiha Anjum About the Expert
Dr. Sabiha Anjum
(Gynecologist/Obstetrician)