Second Pregnancy Due Date Calculator

Calculates the estimated due date for a subsequent pregnancy from the first day of the last menstrual period (LMP + 280 days) and shows the age gap between the first and second child at the projected birth date. Displays current gestational age in weeks and days, trimester identification, and WHO recommendations on ideal pregnancy spacing (18–24 months between delivery and next conception).

Second Pregnancy Due Date Calculator
For informational purposes only.

Second Pregnancy Due Date Calculator

Calculate your due date for a subsequent pregnancy, with age gap from your first child.

RESULT
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The second pregnancy due date calculator estimates your due date from the first day of your last menstrual period and calculates the age gap between your first and second child at the time of birth.

How It Works

Due Date = LMP + 280 days (40 weeks) Age Gap = Due Date − First Child’s Birthday Gestational Age = Today − LMP (in weeks + days)

Ideal Spacing Between Pregnancies

The WHO recommends waiting at least 18–24 months after delivery before conceiving again. This allows the body to fully recover, replenish nutrient stores, and reduces the risk of preterm birth and low birth weight in the subsequent pregnancy.

Common Age Gaps

  • 1–2 years: Close in age, siblings grow up together. Physically demanding for parents.
  • 2–3 years: Most common gap. First child is more independent. Good balance.
  • 3–5 years: First child can help with baby. Less sibling rivalry initially.
  • 5+ years: Almost like having an only child again. Different developmental stages.

Second Pregnancy Due Date Calculator FAQ

How is the due date for my second pregnancy calculated?

Same as the first — LMP + 280 days (40 weeks). The calculation method does not change between pregnancies, though second babies statistically arrive slightly earlier on average.

Are second pregnancies different?

Often yes — many women show earlier, feel movement sooner, and have shorter labour (average 5 hours vs 8 for first-timers). However, every pregnancy is unique.

What is the ideal age gap between children?

The WHO recommends at least 18–24 months between delivery and next conception (roughly 2.5–3 year age gap). This is optimal for maternal health recovery and the second baby's health outcomes.

Do second babies come earlier?

Statistically, second babies arrive a few days earlier on average than first babies, but this varies widely. Second labours are typically shorter — average 5 hours vs 8 for first pregnancies.

Should I plan my second pregnancy around my first child's age?

Consider practical factors: toddler care during pregnancy fatigue, childcare during delivery, financial readiness, and your own physical recovery. There is no perfect timing — only what works for your family.

Is this calculator free?

Yes, completely free. Calculate due date with age gap from your first child instantly.

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