Pregnancy Weight Gain Week by Week: How Much Is Healthy?
Pregnancy weight gain week by week by BMI, trimester and twins, plus extra calories and Indian meal ideas. Check your own target range free.
Written by HealthSensibly Editorial TeamReviewed by the HealthSensibly editorial teamUpdated
Healthy pregnancy weight gain week by week depends on your BMI before pregnancy. Most women gain only 0.5–2 kg in the first trimester, then about 0.35–0.5 kg a week from the second trimester if they started at a healthy weight, reaching a total of 11.5–16 kg. Women who start underweight need more; those who start heavier need less.
Recommended total weight gain by pre-pregnancy BMI
Doctors usually start with your body mass index (BMI) from before pregnancy, or from your first antenatal visit. The table below shows the 2009 IOM guidelines, which are used by ACOG and many clinics in India and worldwide. The weekly rate applies to the second and third trimesters.
| Pre-pregnancy BMI | Category | Total gain (single baby) | Weekly gain, 2nd and 3rd trimester |
|---|---|---|---|
| Below 18.5 | Underweight | 12.5–18 kg | about 0.44–0.58 kg |
| 18.5–24.9 | Healthy weight | 11.5–16 kg | about 0.35–0.50 kg |
| 25.0–29.9 | Overweight | 7–11.5 kg | about 0.23–0.33 kg |
| 30.0 and above | Obese | 5–9 kg | about 0.17–0.27 kg |
A note for South Asian women: the WHO has suggested that health risks in Asian populations start at lower BMI levels, and some Indian guidelines use 23 rather than 25 as the overweight cut-off. Pregnancy weight targets for Indian women are still mostly based on the IOM table, but your doctor may set a personal goal. To see your own target range, enter your height, weight and week into our pregnancy weight gain calculator.
The trimester pattern: how gain builds week by week
First trimester (weeks 1–13)
Your baby is tiny at this stage, so weight changes little. A gain of 0.5–2 kg over the whole trimester is typical. Many women with nausea or vomiting stay the same or even lose a little, which is usually fine if it is mild and you can keep fluids down.
Second trimester (weeks 14–27)
Appetite usually returns and gain becomes steady. Blood volume rises, the uterus grows and the baby begins to lay down tissue. For a woman of healthy weight, roughly 0.35–0.5 kg a week is expected.
Third trimester (weeks 28–40)
The baby gains most of its weight now, but your own gain often continues at a similar weekly pace. It may slow a little in the final weeks. Fluid retention can cause small jumps on the scale from day to day.
| By the end of week | Healthy-weight start: approximate cumulative gain |
|---|---|
| 12 | 0.5–2 kg |
| 16 | 2–4 kg |
| 20 | 3.5–6 kg |
| 24 | 5–8 kg |
| 28 | 6.5–10 kg |
| 32 | 8–12 kg |
| 36 | 9.5–14 kg |
| 40 | 11.5–16 kg |
These figures are worked out from the IOM ranges and are a guide, not a pass-or-fail test. Women gain in different patterns, and one heavy week is not a problem on its own. What matters is the overall trend, which you can track with our week-by-week weight gain tool.
Weight gain with twins
Carrying twins needs more weight gain to support two babies, two sets of fluid and often a larger placenta. The IOM offers provisional ranges for twin pregnancies:
- Healthy weight before pregnancy: 17–25 kg
- Overweight: 14–23 kg
- Obese: 11–19 kg
There was not enough evidence to set a range for underweight women carrying twins, so care is planned individually. Twin pregnancies are monitored more closely, and your obstetrician will guide you on diet and growth scans.
What the weight is actually made of
It helps to know that most of the gain is not fat. For a healthy-weight woman gaining around 12–14 kg, the approximate breakdown is:
- Baby: about 3–3.5 kg
- Placenta: about 0.7 kg
- Amniotic fluid: about 0.8 kg
- Larger uterus: about 0.9 kg
- Breast tissue: about 0.4–0.9 kg
- Extra blood: about 1.2–1.8 kg
- Extra body fluid: about 1.2–1.8 kg
- Fat and nutrient stores: about 2.5–3.5 kg, used for breastfeeding
A large part of this weight leaves the body at birth or within the first few weeks. Breastfeeding, sleep, gentle activity and balanced meals help with the rest over the following months.
Eating for one-and-a-bit, not two
The old advice to “eat for two” leads many women to gain far more than they need. Energy needs rise only modestly, and mainly after the first trimester. ACOG gives these rough figures for a single pregnancy in a woman of healthy weight:
| Trimester | Extra calories per day | Roughly equal to |
|---|---|---|
| First | None for most women | No change; focus on quality |
| Second | About 340 kcal | 1 katori dal + 1 roti + 1 glass milk |
| Third | About 450 kcal | The above plus a fruit and a few nuts |
India’s ICMR-NIN 2020 recommendations similarly suggest about 350 extra kcal a day for pregnant women, along with extra protein that rises through pregnancy. Overweight women, very active women and those carrying twins may need different amounts, so check with your doctor or dietitian.
The quality of food matters more than the quantity. Pregnancy raises the need for protein, iron, folate, calcium, iodine and vitamin B12. In India, iron and folic acid tablets and calcium supplements are routinely given through antenatal care; take them as prescribed.
Indian meal ideas for healthy pregnancy weight gain
Breakfast
- Vegetable poha with peanuts and a side of curd
- Moong dal or besan chilla stuffed with paneer
- Ragi dosa or idli with sambar
- Methi thepla with curd
- Vegetable dalia or oats upma; eggs if you eat them
Lunch and dinner
- 2 rotis or a bajra/jowar rotla, a full katori of dal, a green leafy sabzi (palak, methi, amaranth) and salad
- Rice with rajma or chole, raita and cooked vegetables
- Moong dal khichdi with kadhi and a vegetable
- Well-cooked fish or chicken curry with roti and sabzi, if non-vegetarian
Snacks
- A glass of milk or chaas
- Roasted chana, makhana or a small handful of nuts and dates
- Seasonal fruit such as guava, orange, banana or chikoo
- Sprout chaat, or a homemade ragi or til ladoo in a small portion
If you are gaining slowly, add an extra snack, a spoon of ghee or nut butter, or an extra glass of milk. If you are gaining quickly, cut down on sweets, fried farsan, bakery items and sugary drinks first rather than skipping meals. You can check the nutrition of individual foods in our Food A–Z guide, and find more tools on the health tools page.
Food safety matters too: avoid raw or undercooked eggs, meat and fish, unpasteurised milk and soft cheese, and wash fruit and vegetables well.
When gain is too fast or too slow
Gaining well above the recommended range raises the risk of gestational diabetes, high blood pressure, a large baby, caesarean birth and weight that stays on after delivery. Gaining too little is linked to a higher risk of a small baby and preterm birth. Both are worth discussing early, not only at the end of pregnancy.
Weigh yourself at the same time of day, on the same scale, once a week or as your doctor advises. Daily weighing mostly shows changes in fluid and can cause unnecessary worry.
When to see a doctor
Contact your doctor or go to hospital urgently if you notice:
- A sudden gain of more than about 1 kg in a week, especially with swelling of the face, hands or feet
- Severe headache, blurred vision, flashing lights or pain just below the ribs, which can be signs of pre-eclampsia
- Vomiting so severe you cannot keep food or fluids down, or weight loss after the first trimester
- Very high thirst and frequent urination
- Reduced baby movements in later pregnancy
- Bleeding or fluid leaking from the vagina
Also talk to your doctor if your gain is clearly outside your target range for several weeks in a row.
Frequently asked questions
How much weight should I gain in the first trimester?
Most women gain 0.5–2 kg in the first 13 weeks. Losing a small amount because of nausea is common and usually not a concern, but persistent vomiting needs medical review.
Is it safe to lose weight during pregnancy if I am overweight?
Deliberate dieting to lose weight is generally not advised during pregnancy. Overweight and obese women are usually advised to gain less, not to lose. Your doctor may give a personal target.
How much weight will I lose right after delivery?
Many women lose around 5–6 kg at birth from the baby, placenta and fluid, and a few more kilograms of fluid over the following weeks. The remaining weight usually comes off gradually over months.
Can I exercise while pregnant to control weight gain?
For most healthy pregnancies, yes. The WHO advises at least 150 minutes of moderate activity a week, such as walking, swimming or prenatal yoga. Check with your doctor first if you have any complications.
Sources
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Medical disclaimer. This article shares general health information only. It doesn’t replace diagnosis, treatment or advice from a medical professional — if you have symptoms or are worried, see a qualified doctor.
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