The idea of "eating for two" has been passed down through generations, but a healthy pregnancy diet has less to do with quantity and more to do with eating well. Getting the right nutrition at the right time is essential to support a growing baby, and what the body needs will shift from one trimester to the next.
That said, knowing what to eat during this time can feel overwhelming, especially with pregnancy cravings and changing appetites in the mix.
Understanding what the body needs at each stage makes it far easier to build a practical, manageable approach to pregnancy nutrition.
What a Healthy Pregnancy Diet Looks Like
A well-rounded diet for pregnancy covers four main food groups:
- Rice and alternatives
- Fruits
- Vegetables
- Meat and alternatives, with dairy included separately for calcium needs
Most pregnant women need only a modest caloric increase of around 370 to 480 extra calories a day, achievable through one or two nutrient-dense snacks rather than large meals.
Having a variety across the food groups, rather than eating more of any one thing, is the foundation of good pregnancy nutrition.
Essential Nutrients to Prioritise During Pregnancy
A balanced diet covers the basics, but certain nutrients deserve extra attention because of their direct role in foetal development and maternal wellbeing.
- Folate and folic acid: Critical for neural tube development, especially in the first trimester. Found in leafy greens, legumes, and fortified cereals.
- Iron: Needed in roughly double the pre-pregnancy amount to support increased blood production and prevent anaemia. Good sources include dark greens, beans, and lentils.
- Calcium: Required at around 1,000 mg per day to support the baby's bone and teeth development. Sources include low-fat milk, high-calcium soy milk, and hard cheese.
- Vitamin D: Works alongside calcium for bone formation. Found in fatty fish, eggs, and fortified milk.
- Protein: Essential for organ and tissue growth across all three trimesters. Sourced from poultry, eggs, fish, beans, and low-fat dairy.
If necessary, a daily prenatal supplement can help fill nutritional gaps. Consult your healthcare provider for personalised guidance on what is right for you.
What to Eat During Pregnancy: A Trimester-by-Trimester Guide
Nutritional needs shift at each stage of pregnancy. As such, tailoring choices around food to eat during each pregnancy trimester helps ensure you and your baby get what you need most when you need it.
First Trimester
The first trimester (months 1 to 3) is when foundational organ development takes place, making folic acid, protein, and iron priority nutrients.
Morning sickness can make eating a varied diet difficult at this pregnancy stage, so eating small, frequent meals and choosing bland, easy-to-digest foods helps. Vitamin C-rich fruits, such as oranges, kiwi, and guava, are also worth reaching for to aid iron absorption.
Second Trimester
Energy typically returns in the second trimester, and appetite increases alongside it. This makes it an ideal window to build more variety into daily meals.
Calcium and protein become particularly important as the baby enters its most rapid growth phase, so incorporating oily fish, legumes, whole grains, and dairy makes good nutritional sense.
Additionally, fruits like ripe papaya, avocado, banana, and watermelon are also worth including for their folate, healthy fats, potassium, and hydration.
Third Trimester
The third trimester is when the baby gains the most weight and begins storing iron and other nutrients for use after birth, making iron and omega-3 fatty acids especially important.
As the uterus grows, your stomach capacity decreases. As such, opt for smaller and more frequent meals to maintain adequate intake while staying comfortable.
What you eat in the final trimester also begins laying the groundwork for breastfeeding, as nutrients, such as iodine, omega-3s, and vitamin D, will pass through breast milk postpartum. As such, milk booster food choices are also worth exploring early.
Foods and Drinks to Avoid During Pregnancy
Foods to Avoid While Pregnant
- Raw or undercooked meat, poultry, and seafood: Foods like sushi and rare steaks carry risks of listeria, salmonella, and toxoplasmosis, which can cause serious complications during pregnancy. Always ensure meat and seafood are cooked through to a safe internal temperature before eating.
- Raw or soft-boiled eggs: These carry a risk of salmonella, which can cause severe food poisoning. Opt for fully cooked eggs where both the white and yolk are firm.
- Unpasteurised dairy and soft-ripened cheeses: Cheeses like brie or camembert may contain listeria, a bacterium that can cross the placenta and harm the baby. Stick to hard cheeses and products clearly labelled as made from pasteurised milk.
- High-mercury fish: Mercury accumulates in the body over time and can affect the baby's developing brain and nervous system. Avoid items like shark, swordfish, and king mackerel and choose options like salmon and sardines instead.
- Excess liver and liver products: These contain dangerously high levels of vitamin A, which can interfere with the baby’s organ development. Avoid them, especially in the first trimester.
Drinks to Avoid While Pregnant
- Alcohol: There is no known safe level of alcohol during pregnancy. It should be avoided entirely across all three trimesters.
- Excess caffeine: High caffeine consumption has been linked to low birth weight and an increased risk of miscarriage. As such, intake should be limited to no more than 200 mg per day, roughly equivalent to one cup of coffee.
- Unpasteurised juices: Fresh-pressed and unpasteurised juices can harbour harmful bacteria, such as Salmonella and E. coli. Instead, choose pasteurised juices or prepare fresh fruit at home under hygienic conditions.
- Herbal teas and tonics: Not all herbal preparations are safe for pregnancy, and some may stimulate uterine contractions or interfere with foetal development. Check with your healthcare provider before consuming any herbal preparation during pregnancy.
A Well-Fed Pregnancy is the Best Kind of Preparation
A healthy pregnancy diet comes down to variety, a handful of key nutrients, and a short list of foods to steer clear of. No single meal needs to be perfect to make a difference. Rather, make small, consistent choices across all three trimesters that add up to meaningful support for you and your baby.
While nutrition is an important part of birth preparation, understanding what lies ahead, from labour to newborn feeding, is also essential to make the whole journey feel more manageable.
Flegen's pregnancy classes cover every stage, from labour preparation to feeding your newborn, offering the guidance and support to feel confident and ready.
Get in touch with us today to find out how we can support you through every step of the journey.