Baby Weight: kg to lbs and oz Conversion Chart

2-12 kg range for infants (0-24 months)

Pediatric NHS/WHO Infant Care

kg → lb Quick Converter

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What is Kilogram (kg)?

The kilogram (kg) is the SI base unit of mass. Since 2019, it is defined by fixing the numerical value of the Planck constant, ensuring stability independent of physical artifacts.The kilogram is universally used in science, engineering, medicine, commerce, and daily life, forming the reference point for all metric and many non-metric mass units.

What is Pound (lb)?

The pound (lb) is a unit of mass used mainly in the United States and a few other countries.

How to Convert Kilogram to Pound

lbs = kg × 2.20462

Example

Convert 3.00 kg to lb:

3.00 × 2.20462 = 6.61387 lb

Baby Weight: kg to lbs and oz Conversion Chart

Values from 2.00 to 12.00 kg.

kg to lb (2.00 – 7.00 kg)
kg lb lbs + oz
2.00 4.40925 4 lbs 6.5 oz
2.25 4.9604 4 lbs 15.4 oz
2.50 5.51156 5 lbs 8.2 oz
2.75 6.06271 6 lbs 1.0 oz
3.00 6.61387 6 lbs 9.8 oz
3.25 7.16502 7 lbs 2.6 oz
3.50 7.71618 7 lbs 11.5 oz
3.75 8.26733 8 lbs 4.3 oz
4.00 8.81849 8 lbs 13.1 oz
4.25 9.36965 9 lbs 5.9 oz
4.50 9.9208 9 lbs 14.7 oz
4.75 10.472 10 lbs 7.6 oz
5.00 11.0231 11 lbs 0.4 oz
5.25 11.5743 11 lbs 9.2 oz
5.50 12.1254 12 lbs 2.0 oz
5.75 12.6766 12 lbs 10.8 oz
6.00 13.2277 13 lbs 3.6 oz
6.25 13.7789 13 lbs 12.5 oz
6.50 14.33 14 lbs 5.3 oz
6.75 14.8812 14 lbs 14.1 oz
7.00 15.4324 15 lbs 6.9 oz
kg to lb (7.25 – 12.00 kg)
kg lb lbs + oz
7.25 15.9835 15 lbs 15.7 oz
7.50 16.5347 16 lbs 8.6 oz
7.75 17.0858 17 lbs 1.4 oz
8.00 17.637 17 lbs 10.2 oz
8.25 18.1881 18 lbs 3.0 oz
8.50 18.7393 18 lbs 11.8 oz
8.75 19.2904 19 lbs 4.6 oz
9.00 19.8416 19 lbs 13.5 oz
9.25 20.3928 20 lbs 6.3 oz
9.50 20.9439 20 lbs 15.1 oz
9.75 21.4951 21 lbs 7.9 oz
10.00 22.0462 22 lbs 0.7 oz
10.25 22.5974 22 lbs 9.6 oz
10.50 23.1485 23 lbs 2.4 oz
10.75 23.6997 23 lbs 11.2 oz
11.00 24.2508 24 lbs 4.0 oz
11.25 24.802 24 lbs 12.8 oz
11.50 25.3532 25 lbs 5.7 oz
11.75 25.9043 25 lbs 14.5 oz
12.00 26.4555 26 lbs 7.3 oz

Baby Weight Milestones (WHO/NHS Standards)

  • Birth: 2.5-4 kg (5 lbs 8 oz - 8 lbs 13 oz)
  • 3 months: 5-6.5 kg (11 lbs - 14 lbs 5 oz)
  • 6 months: 6.5-8 kg (14 lbs 5 oz - 17 lbs 10 oz)
  • 9 months: 7.5-9.5 kg (16 lbs 8 oz - 20 lbs 15 oz)
  • 12 months: 8.5-11 kg (18 lbs 12 oz - 24 lbs 4 oz)

Based on WHO growth standards used by NHS and pediatric professionals worldwide. Consult your health visitor or pediatrician for individual assessments.

← Use our interactive kilogram to pound converter

Frequently Asked Questions

What is a normal baby weight in kg?

Newborns typically weigh 2.5-4 kg (5 lbs 8 oz - 8 lbs 13 oz). By 6 months, babies usually weigh 6.5-8 kg (14 lbs 5 oz - 17 lbs 10 oz).

How do I convert my baby's weight from kg to pounds and ounces?

Multiply kg by 2.20462 to get total pounds. Take the whole number as pounds, then multiply the decimal by 16 for ounces. Example: 5 kg = 11.02 lbs = 11 lbs 0.4 oz.

Does the NHS use kg or lbs for baby weight?

The NHS uses kilograms (kg) as the standard unit for baby weight in the UK. However, many parents prefer pounds and ounces, so health visitors often provide both measurements. This chart helps convert between the two systems.

Why use 0.25 kg increments for baby weight?

Babies gain weight quickly in small amounts. Using 0.25 kg steps (about 0.55 lbs or 8.8 oz) provides the precision needed for accurate pediatric tracking and growth monitoring.

Related Conversion Tables

Body Weight

40-120 kg

Luggage

15-32 kg

Cooking

0.1-5 kg

Complete

1-200 kg

← Back to kg to lbs Tables

Related Weight Tools

Conversion factors verified against NIST (National Institute of Standards and Technology), BIPM (International Bureau of Weights and Measures) 1 lb = 0.45359237 kg by international agreement (1959). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes