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Pregnancy Health

My Doctor Says My Baby Weighs Only 1 Pound - So Why Have I Gained 15?

UI

Ultrasound Ireland

Medical Team

17 February 20213 min read

If you've stepped on the scales and wondered why you've gained so much more than your baby weighs, you're not alone! Here's where that weight actually goes.

The Weight Breakdown

Your pregnancy weight gain is distributed across many areas - not just baby! Here's the typical breakdown:

Component Weight (approx.)
Baby 7-8 pounds
Placenta 1-2 pounds
Uterus 2 pounds
Amniotic fluid 2 pounds
Breast tissue 2 pounds
Blood volume increase 4 pounds
Tissue fluid 4 pounds
Fat and nutrient stores 7 pounds

The Total

By delivery, you can expect to have gained approximately 30 pounds - give or take, depending on your pre-pregnancy weight and individual circumstances.

Why So Much?

The phrase "blood, breast, and baby fat are heavy baggage" sums it up well! Your body is:

  • Creating a life support system - the placenta and amniotic fluid protect and nourish your baby
  • Increasing blood volume - by up to 50% to supply oxygen and nutrients
  • Preparing for breastfeeding - breast tissue grows and develops
  • Storing energy - fat reserves help fuel you through labour and breastfeeding

It's All Purposeful

Every pound serves a function. Your body is remarkably designed to support your growing baby and prepare for the demands of childbirth and beyond.

What's Normal?

Recommended weight gain varies based on your pre-pregnancy BMI:

  • Underweight: 12.5-18 kg (28-40 pounds)
  • Normal weight: 11.5-16 kg (25-35 pounds)
  • Overweight: 7-11.5 kg (15-25 pounds)
  • Obese: 5-9 kg (11-20 pounds)

Your healthcare provider can give you personalised guidance.


Track your baby's growth with regular pregnancy scans at Ultrasound Ireland. Call 01 210 0232.

Tags:pregnancyweight-gainhealthbody-changes

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