Pregnancy Weight Tracker
See the healthy weight gain for your starting BMI, week by week, and watch your own line grow against it.
- IOM guidance
- Stays on your phone
- One baby or twins
Where the weight goes
Most of the weight you gain is your baby's world
A typical gain of about 12.5 kg, part by part. Only a small share is stored for feeding, and your body uses it after birth.
3.4 kgYour baby
The average weight at birth.
0.7 kgPlacenta
Carries food and oxygen to your baby.
0.8 kgFluid around the baby
The amniotic fluid that cushions your baby.
1 kgA bigger womb
It grows to many times its size.
0.4 kgBreasts
Getting ready to feed your baby.
1.4 kgExtra blood
Your blood volume rises by almost half.
1.5 kgExtra body fluid
Part of it shows as swollen ankles.
3.3 kgStores for feeding
Energy your body keeps for breastfeeding.
How much to gain
The healthy total depends on where you started
Your BMI before pregnancy sets your range. If you started lighter, you need to gain more; if you started heavier, a little less is healthier for you and your baby.
Your starting BMI: 21.9, healthy weight
-
UnderweightUnder 18.5
Ask your doctor
You -
Healthy weight18.5 to 24.9
17 to 25 kg
You -
Overweight25 to 29.9
14 to 23 kg
You -
Obese30 and over
11 to 19 kg
You
Trimester by trimester
Slow at first, then a steady climb. No eating for two.
-
Weeks 1 to 13
First trimester
About 0.5 to 2 kg in total
No extra food needed yet
Sickness can mean you gain little or even lose a bit. That is common and usually fine.
-
Weeks 14 to 27
Second trimester
A steady gain every week
About 350 extra calories a day
Roughly a glass of milk and a small bowl of dal. Hunger often comes back now.
-
Weeks 28 to 40
Third trimester
The same steady pace
About 450 extra calories a day
Your baby puts on most of their weight now, so your gain keeps going.
Small habits
Six small habits for a healthy gain
Balanced meals
Dal, eggs, paneer, fish or pulses at each meal, with vegetables, fruit and whole grains.
Move every day
A 30 minute walk most days is good for most people. Ask your doctor what suits you.
Plenty of water
About 8 to 10 glasses a day, more in hot weather.
Rest and sleep
Tiredness makes snacking easier. Short rests in the day help.
Weigh once a week
Same day, same time, same scale, before breakfast. Then save it here.
Share it with your doctor
Bring your weigh-ins to each check-up. They help your doctor see the whole picture.
When to call your doctor
Call your doctor the same day if you notice
- Putting on more than 1 kg in a single week
- Sudden swelling of your face, hands or feet
- A bad headache, blurred vision or flashing lights
- Losing weight after the first trimester
- Being sick so often you cannot keep food or water down
- Worries about eating, or not wanting to eat at all
Every body grows a baby differently. The number on the scale is a guide, never a grade.
Questions
What people ask about weight in pregnancy
- 11.5 to 16 kgA healthy total with a healthy starting BMI
- 0.5 to 2 kgAll you usually gain in the first trimester
- 350 to 450Extra calories a day in the second and third
You are growing a whole new person. Be kind to yourself.
Questions about your pregnancy or your weight? Our specialists are happy to talk it through.
How much weight should I gain during pregnancy?
It depends on your weight before pregnancy. With a healthy BMI (18.5 to 24.9) the usual range is 11.5 to 16 kg. It is higher if you started underweight and lower if you started overweight.
How much weight should I gain in the first trimester?
Usually only 0.5 to 2 kg in total. Most of the gain comes in the second and third trimesters.
Is it normal to lose weight in the first trimester?
A small loss is common when sickness is bad. If you cannot keep food or water down, or keep losing weight, talk to your doctor.
Do I need to eat for two?
No. You need no extra food in the first trimester, about 350 extra calories a day in the second and about 450 in the third.
How much weight should I gain with twins?
More than with one baby: about 17 to 25 kg with a healthy starting BMI, 14 to 23 kg if overweight and 11 to 19 kg if obese. Your doctor will guide you.
What if I am gaining weight too fast?
Talk to your doctor, especially if you gain more than 1 kg in a week or notice sudden swelling. Never start a diet in pregnancy without their advice.
What if I am not gaining enough?
Mention it at your next check-up. Regular balanced meals and snacks usually help, and your doctor can check your baby is growing well.
Can I lose weight while pregnant?
Dieting to lose weight is not advised in pregnancy. If you started with a high BMI, your doctor may suggest gaining less, with healthy food and gentle activity.
How often should I weigh myself?
Once a week is plenty: the same day, the same time and the same scale, ideally before breakfast.
Where are my weights saved?
Only in this browser on this device. Nothing is sent to us. Use "Clear everything" to remove them.
Please read: a guide, not a diagnosis
- This tracker shows general ranges from the Institute of Medicine (2009) guidance, used by doctors in many countries. It is not medical advice and does not replace your doctor or midwife.
- Some doctors in South Asia use lower BMI cut-offs, and your own target may be different. Always follow the plan your doctor sets for you.
- Weight is only one part of a healthy pregnancy. Your baby's growth is checked at your appointments and scans.
- If you have sudden swelling, a bad headache, blurred vision or pain, call your doctor straight away or your local emergency number.