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How an infant weight chart can help to calculate baby's ideal weight


Most pediatricians use an infant weight chart as a reference for your baby's growth and development.

infant weight cahrt
By Oliver H via Wikimedia Commons

Infant height and weight charts consists of a series of curves that compare an infants measurements with those of other children in the same age group.

Percentiles is the most used indicator for growth patterns in weight charts. There are different charts for boys and girls because their growth patterns are different.




What is the average monthly weight gain for infants?

An infants weight gain depends on more than their diet.

Newborns loose about 5-10% of their birth weight in their first week of life. It may take sometimes 2 to 3 weeks for breast fed infants to regain their birth weight.

The following table shows an infant's avarage monthly weight gain.

Age Lbs/ per month Kilograms/per month
0 - 3 months 2,2 lbs 1 kg
3 - 6 months 1,1 lbs 1/2 kg
6 - 9 months 3/4 lbs 1/3 kg
9 - 12 months 1/2 lbs 1/4 kg


This means that most babies have doubled their birth weight by 4 months and tripled it at the age of 1 year.

Every new mother should realize that every child grows at its own pace. For instance formula fed and breast fed infants gain weight differently.

Breast fed infants are usually leaner and are not gaining weight as fast as formula fed babies. Experts belief this is due to extra water retention and different composition of body fat.

Other factors that may influence an infants weight gain:

  • An infants temparement . A very lively baby burns more calories than an inactive baby.
  • Babies that are breast fed on demand are growing faster than a baby with set feeding times.
  • Different body types and metabolic rates that are usually inherited of the parents.

But what if your baby is not gaining weight as expected?


Infant weight chart for boy or girl

Weight chart.

infant weight chart

You can download and print the infant height and weight charts in PDF format.

Baby lenght and weights chart for boys, birth to 24 months:

  1. Boys Weight-for-length percentiles and Head circumference-for-age percentiles
  2. Boys Length-for-age percentiles and Weight-for-age percentiles


Infant weight chart and lenght chart for girls, birth to 24 months:

  1. Girls Weight-for-length percentiles and Head circumference-for-age percentiles
  2. Girls Length-for-age percentiles and Weight-for-age percentiles


Do you need an infant weight scale?

baby weight scale by health o meter

In baby's first year you will visit your doctor for regular check ups.

If your baby is drinking well and your baby is gaining weight as expected there is realy no reason to purchase an infant weight scale for home use.

Some of these infant scales can be very expensive and prices can range from 50$ to 1300$.

If you still like to keep track of your babies weight gain between regular check ups I can recommend the Health o meter Grow with Me 2-in-1 Baby to Toddler Scale, a reliable scale which costs only about $48. When your child gets old enough to stand you can remove the tray and use it as a toddler scale that weighs up to 60 lbs


Baby Weight Calculator

You can use an online infant growth chart calculator from to find your baby's weight percentile based on age. Results are based on data from the World Health Organisation (WHO).
After you submit baby's birthday, measurement date and weight, you can see the result as a dot on the percentile lines in the infant weight chart.

A percentile of 50% indicates the avarage weight. A value below 50 percent means a baby weighs less than the average. A value greater than 50 percent means baby weighs more than the average. If your baby is not on the 50% line is not a reason to worry your baby is overweight or underweight. Weights and heights that are anywhere within the centile lines on the chart are considered normal.

For example your baby weighs more than the average but is also longer than the average. If you compare the weight with its height this baby is not overweight. If you have doubts consult your doctor and let him determine your infant's weight status.

You may also like to download a free app to track your baby's growth.



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