Pregnancy nutrition guide

Pregnancy nutrition for weeks 17–20

This period is often when movement becomes obvious, and the fetus keeps building capacity for life outside the womb.

Movement + senses (a very active stretch)

What is developing

  • Fingerprints and nails form; grip strengthens.
  • Movement increases and responses to sound can begin.
  • Weight gain starts to accelerate and the fetus begins to "fill out" over time.

Nutrients to prioritize

These food ideas support general nutrition planning. They are not medical advice and do not replace prenatal vitamins or clinician guidance.

Iron

High priority

Iron supports red blood cell production and oxygen delivery for both you and the fetus.

Iron needs increase in pregnancy and iron deficiency is common; adequacy supports healthy red blood cells.

Protein

High priority

Growth is the main job right now, and protein is the main building material.

Protein needs rise in pregnancy overall and support fetal growth.

DHA

Medium priority

Brain and nervous system development continues all pregnancy long.

Omega-3s (including DHA) contribute to brain and retina structure.

Vitamin C

Supporting priority

Vitamin C supports collagen formation and helps improve iron absorption from plant foods.

Vitamin C is involved in collagen synthesis and can increase nonheme iron absorption.

Practical notes

  • Second trimester often means about 340 extra calories/day, depending on your starting weight and situation.

Sources