Protein Requirements During Pregnancy — How protein needs change during pregnancy and postpartum for supporting fetal development and maternal recovery. Protein intake must increase significantly across trimesters to support placental growth, fetal tissue development, expanded blood volume, and the body's preparation for breastfeeding and postpartum healing.
S&J Nourish™ Plant Protein
20g protein · All 9 EAAs · Free from all 9 allergens · NSF Certified
How Protein Requirements During Pregnancy Work
Protein demands rise progressively throughout pregnancy as the body supports rapid fetal growth and undergoes significant physiological changes. According to the Dietary Reference Intakes from the National Academies, pregnant women need 71 grams of protein per day, compared with 46 grams for non-pregnant women. However, recent research suggests this figure may underestimate actual needs. A 2015 study published in the Journal of Nutrition used the indicator amino acid oxidation method and estimated average protein requirements of about 1.2 grams per kilogram of body weight per day in early pregnancy and 1.5 g/kg in late pregnancy, well above the current estimate of 0.88 g/kg.
During the first trimester, protein supports the formation of the placenta and the early stages of organ development. By the second and third trimesters, the fetus is growing rapidly, and the mother’s blood volume increases substantially.
The quality of protein matters as much as the quantity. Complete proteins that supply all nine essential amino acids are especially important during pregnancy because the developing fetus cannot synthesize these amino acids independently. Distributing protein intake across meals rather than concentrating it in one or two servings helps maintain steady amino acid availability for the fetus throughout the day.
Why Protein Requirements During Pregnancy Matter for Your Health
Meeting protein needs during pregnancy directly impacts both immediate outcomes and long-term health for mother and child. Low birth weight is associated with increased risk of chronic health conditions later in the child's life, including cardiovascular disease and type 2 diabetes.
For the mother, protein is essential for postpartum recovery and breastfeeding. The National Academies Dietary Reference Intakes set protein needs during breastfeeding at 71 grams per day, 25 grams more than for non-pregnant women, to support milk production. Many women experience significant muscle loss during pregnancy and the postpartum period, and adequate protein intake combined with gentle physical activity helps rebuild strength and support recovery of the pelvic floor, abdominal wall, and overall musculoskeletal system.
Practical Takeaways
- Aim for at least 71 grams of protein per day during pregnancy, the RDA set by the National Academies, and ask your doctor or dietitian whether you need more in the third trimester, as recent research suggests late-pregnancy needs may be higher
- Distribute protein evenly across three to four meals per day, targeting 20 to 25 grams per meal, to maintain steady amino acid supply for fetal development
- Choose protein sources that are also rich in iron and folate, such as lentils, beans, eggs, and lean meats, to address multiple pregnancy nutritional needs simultaneously
- During breastfeeding, increase daily protein intake by about 25 grams above the non-pregnant RDA, in line with the National Academies’ Dietary Reference Intakes
- If morning sickness makes solid food difficult, protein shakes or smoothies can provide an easily digestible alternative to help meet daily targets during the first trimester
For pregnant and breastfeeding women with food sensitivities, S&J Nourish™ offers 20g of plant-based protein per serving that is free from all eight major allergens and NSF certified, providing peace of mind during a time when ingredient safety is paramount.