Does this baby growth tool calculate official percentiles?

No. This tool uses approximate reference ranges for weight and length from birth to 12 months, but it does not calculate exact WHO or CDC growth percentiles. Only a healthcare professional who uses official growth charts can provide an accurate percentile and interpretation.

Can this growth checker replace my baby's regular check-ups?

No. Regular check-ups with a healthcare provider are essential. During those visits, your baby's weight, length and head circumference are measured and plotted on official growth charts, and the doctor or nurse assesses overall health and development.

How often should I measure my baby's weight and length?

Your healthcare provider will usually measure growth at scheduled visits, such as at 1, 2, 4, 6, 9 and 12 months. You can measure at home if recommended, but any concerns or unusual changes should be discussed with a professional.

Baby Growth Checker - Canadahealthjournal.ca

Q: What if my baby is below or above the typical range?

Some babies are naturally smaller or larger than others. Being a little outside the typical range does not automatically mean there is a health problem. However, if you are worried about feeding, weight gain, length or development, you should talk to a pediatrician or family doctor.

Q: When should I seek medical advice about my baby's growth?

You should seek medical advice if you have concerns about poor weight gain, rapid changes in weight or length, feeding difficulties, low energy, or if your instincts tell you something is not right. It is always appropriate to ask your healthcare provider for guidance.

Baby Growth Checker (Weight & Length, 0–12 months)

This baby growth checker uses approximate reference ranges for weight and length from birth to 12 months, for boys and girls. It compares your baby’s measurements with typical ranges for their age, but it does not calculate official growth chart percentiles or provide a diagnosis. Always discuss your child’s growth with a pediatrician or other healthcare professional.

Check your baby’s growth

Enter your baby’s age in months, sex, weight and length. The tool will compare these values with typical ranges for that age and explain whether they fall below, within or above those ranges.

This tool is for educational use only. It uses approximate reference values and does not calculate official WHO or CDC percentiles. Only a healthcare professional who reviews full growth charts and your baby’s medical history can interpret growth accurately or diagnose a problem.

How this baby growth checker works

The calculator uses approximate ranges for weight and length (minimum, average and maximum) for each month from birth to 12 months, for boys and girls. After you enter your baby’s age, sex, weight and length, it:

Converts values to kilograms and centimetres if needed
Finds the typical range for that age and sex
Shows whether your baby’s measurements are below, within or above that range
Highlights whether they are on the lower side, around the average or on the higher side of the typical range

Even when a baby’s measurements fall outside a typical range, it does not automatically mean something is wrong. Some babies are naturally smaller or larger than others. Growth needs to be interpreted over time, using official growth charts and a full medical assessment.

Baby growth – Frequently asked questions

Does this tool show official growth chart percentiles?

No. This tool uses approximate reference ranges based on common growth standards, but it does not calculate exact WHO or CDC percentiles. Only your child’s healthcare provider can plot your baby’s measurements on official growth charts and interpret the percentiles.

What if my baby is below or above the typical range?

Being slightly below or above a typical range may still be normal for your baby, especially if they have always followed a similar pattern and are otherwise healthy. If you are worried about weight gain or length, talk to your pediatrician or family doctor.

How often should I check my baby’s growth?

Healthcare providers usually check growth at regular well-baby visits (for example at 1, 2, 4, 6, 9 and 12 months). You can use this tool between visits as an educational guide, but it does not replace professional growth monitoring.

Is it normal for growth to slow down or speed up?

Growth is not always perfectly steady. There can be periods of faster growth and slower growth. What matters most is the overall pattern over time. Your healthcare provider can explain whether your baby’s growth pattern looks reassuring.

When should I seek medical advice about my baby’s growth?

You should contact a healthcare professional if you are worried about your baby’s feeding, weight gain, length, energy levels or development. Trust your instincts – if something does not feel right, it is always appropriate to ask for help.

Baby Growth Charts Canada (0–12 Months)

These baby growth tables show approximate average weight and length for boys and girls from birth to 12 months, using kilograms and centimetres as in Canadian clinics, with approximate conversions to pounds and inches for parents who prefer imperial units. Values are approximate and based on common international growth standards. They are for information only and do not replace official growth charts or medical advice.

Average Weight by Age – Boys and Girls (Canada)

The table below shows the approximate average weight for boys and girls at each month of age from birth to 12 months. Individual babies can be healthy at weights above or below these averages.

Age	Boy – weight (kg)	Boy – weight (lb)	Girl – weight (kg)	Girl – weight (lb)
Birth (0 months)	3.3	7.3	3.2	7.1
1 month	4.5	9.9	4.2	9.3
2 months	5.6	12.3	5.1	11.2
3 months	6.4	14.1	5.8	12.8
4 months	7.0	15.4	6.4	14.1
5 months	7.5	16.5	6.9	15.2
6 months	7.9	17.4	7.3	16.1
7 months	8.3	18.3	7.6	16.8
8 months	8.6	19.0	7.9	17.4
9 months	8.9	19.6	8.2	18.1
10 months	9.2	20.3	8.5	18.7
11 months	9.4	20.7	8.7	19.2
12 months	9.6	21.2	8.9	19.6

Note: These values represent approximate averages. Healthy babies can fall above or below these numbers. Always discuss growth with your child’s healthcare provider.

Average Length/Height by Age – Boys and Girls (Canada)

The table below shows the approximate average length (height) for boys and girls at each month of age from birth to 12 months. Measurements in centimetres are typical for Canadian clinics, with approximate conversions to inches.

Age	Boy – length (cm)	Boy – length (in)	Girl – length (cm)	Girl – length (in)
Birth (0 months)	50	19.7	49	19.3
1 month	55	21.7	54	21.3
2 months	58	22.8	57	22.4
3 months	61	24.0	60	23.6
4 months	63	24.8	62	24.4
5 months	65	25.6	64	25.2
6 months	67	26.4	65	25.6
7 months	68	26.8	67	26.4
8 months	70	27.6	68	26.8
9 months	71	28.0	69	27.2
10 months	72	28.3	70	27.6
11 months	73	28.7	71	28.0
12 months	74	29.1	72	28.3

Note: Small differences in length can come from measurement technique, baby movement and rounding of values. Your healthcare provider will use official growth charts to interpret your baby’s measurements over time.