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This guide is for educational purposes only. Always consult your healthcare provider about your pregnancy weight gain.
Pregnancy Progress
Week 12 of 40 (30%)
1-4.5
lbs gained to date
28-40 lbs
total target
Minimal
lbs/week rate
No change
cal/day extra
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The fetus is the size of a lime. Reflexes develop. Fingernails start forming. End of the first trimester.
End of the first trimester. Miscarriage risk drops significantly.
Critical for neural tube development. Prevents birth defects of the brain and spine.
Supports increased blood volume and prevents anemia. Needs increase throughout pregnancy.
Supports calcium absorption and bone development. Many women are deficient.
Supports developing bones and teeth. Your body will pull from your bones if intake is low.
No extra calories needed
During the first trimester, your calorie needs do not increase. Focus on nutrient quality over quantity.
During the first trimester, you need about no additional extra calories per day above your pre-pregnancy intake. This supports fetal growth and your increased metabolic needs.
During the first trimester (week 12), key nutrients include iron (27 mg/day), calcium (1,000 mg/day), and vitamin D (600 IU/day). A prenatal vitamin covers most needs.
If you are gaining more than the recommended 28-40 lbs for Underweight BMI, talk to your provider. Focus on nutrient-dense foods, regular gentle activity, and avoid restricting calories without medical guidance.
If your gain is below the 28-40 lb range for Underweight BMI by week 12, discuss it with your provider. Inadequate gain can affect fetal growth. Small, frequent, calorie-dense meals may help.
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