What is a normal weight percentile for a baby?

Any percentile between the 5th and 95th is considered normal for a baby. The 50th percentile means your baby weighs more than 50% of babies the same age and gender. Both high and low percentiles can be normal — what matters most is consistent growth over time, not a single measurement.

What is the average weight of a newborn baby?

The average birth weight for a full-term baby is approximately 3.4 kg (7.5 lbs). Normal birth weight ranges from 2.5 kg (5.5 lbs) to 4.5 kg (10 lbs). Babies born below 2.5 kg are considered low birth weight and may need additional medical monitoring.

How much should a baby gain weight per week?

In the first 3 months, babies typically gain 150-200g (5-7 oz) per week. From 3-6 months, the rate slows to about 100-150g (3.5-5 oz) per week. By 12 months, most babies have tripled their birth weight. These are averages — consult your pediatrician for personalized guidance.

When should I be concerned about my baby's weight?

Consult your pediatrician if your baby falls below the 5th percentile, drops more than 2 major percentile lines (e.g. from 50th to 10th), loses weight after the first 2 weeks, or fails to regain birth weight within 2 weeks. Single measurements matter less than growth trends over time.

Baby Weight Percentile Calculator | CDC Growth Chart — Daily Health Tools

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What is a Weight Percentile?
What is a Normal Baby Weight?
Baby Weight Chart by Age
How Much Should Babies Gain?
When to See a Doctor
Frequently Asked Questions

What is a Baby Weight Percentile?

A baby weight percentile shows how your baby's weight compares to other babies of the same age and gender. For example, a baby at the 60th percentile weighs more than 60% of babies the same age. Percentiles are based on CDC and WHO growth charts used by pediatricians worldwide.

Percentiles do not measure whether a baby is "healthy" on their own — they simply show where your baby falls on the growth curve. Any percentile from the 5th to the 95th is generally considered within the normal range. What matters most is that your baby is growing consistently over time.

What is a Normal Baby Weight?

The average birth weight for a full-term baby is approximately 3.4 kg (7.5 lbs). A normal birth weight ranges from 2.5 kg to 4.5 kg (5.5 – 10 lbs). Babies born below 2.5 kg are considered low birth weight and may need additional medical attention.

By their first birthday, most babies triple their birth weight — reaching around 9–10 kg (20–22 lbs). Girls and boys have slightly different growth patterns, which is why separate growth charts exist for each gender.

Baby Weight Chart by Age (CDC Standards)

The table below shows approximate weight ranges for the 10th, 50th, and 90th percentiles for boys and girls:

Age	Girls — 10th/50th/90th (kg)	Boys — 10th/50th/90th (kg)
Birth	2.8 / 3.3 / 3.9	2.9 / 3.5 / 4.1
3 months	4.8 / 5.8 / 6.9	5.3 / 6.4 / 7.5
6 months	6.1 / 7.3 / 8.7	6.7 / 7.9 / 9.2
9 months	7.1 / 8.5 / 10.0	7.7 / 9.2 / 10.7
12 months	7.8 / 9.5 / 11.2	8.4 / 10.2 / 11.9
18 months	9.0 / 10.9 / 12.9	9.7 / 11.5 / 13.5
24 months	9.9 / 12.0 / 14.3	10.5 / 12.5 / 14.9
36 months	11.4 / 14.0 / 16.9	12.0 / 14.5 / 17.4

How Much Should Babies Gain Per Week?

0–3 months: 150–200g (5–7 oz) per week
3–6 months: 100–150g (3.5–5 oz) per week
6–12 months: 70–90g (2.5–3 oz) per week
12–24 months: 40–60g (1.5–2 oz) per week

These are averages. Every baby grows at their own pace, and brief periods of slower gain are normal — especially during illness or developmental leaps.

When Should I See a Doctor?

Consult your pediatrician if:

Your baby falls below the 5th percentile consistently
Your baby's percentile drops more than 2 major lines (e.g. from 50th to 10th)
Baby loses weight after the first 2 weeks of life
Baby does not regain birth weight within 2 weeks
You are concerned about feeding, latch, or formula intake

Remember: a single percentile number is less important than the trend over multiple visits. A baby consistently at the 10th percentile is growing normally for them.

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Reviewed by Daily Health Tools Team

Based on CDC and WHO child growth standards. For informational purposes only — always consult your pediatrician. Last updated July 2026.

Frequently Asked Questions

Any percentile between the 5th and 95th is considered normal. The 50th percentile means your baby weighs more than 50% of babies the same age. Both high and low percentiles can be completely normal — consistent growth over time matters more than a single number.

The average birth weight is approximately 3.4 kg (7.5 lbs). Normal birth weight ranges from 2.5 kg to 4.5 kg (5.5–10 lbs). Babies below 2.5 kg are considered low birth weight and may need additional monitoring.

In the first 3 months, babies typically gain 150–200g (5–7 oz) per week. From 3–6 months, this slows to 100–150g. By 12 months, most babies have tripled their birth weight. Consult your pediatrician for personalized guidance.

See your pediatrician if your baby falls below the 5th percentile, drops more than 2 major percentile lines, loses weight after the first 2 weeks, or fails to regain birth weight within 2 weeks. Trends over time matter more than a single measurement.

Yes. WHO charts (used for 0–2 years) are based on babies raised in optimal conditions including breastfeeding. CDC charts reflect how babies actually grow in a diverse population. Most pediatricians use WHO charts for infants under 2 and CDC charts for children 2 and older.

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