How many pounds is 3.5 kg for a baby?

3.5 kg is 7.72 lb, or 7 lb 11.5 oz.

How do I convert a birth weight in grams to pounds and ounces?

Divide grams by 28.35 to get total ounces, then divide by 16. The whole number is pounds and the remainder is ounces. For example, 3460 g is 7 lb 10.0 oz.

What is 7 lb 8 oz in kg?

7 lb 8 oz is 3.402 kg, or about 3402 g.

Is this chart medical advice?

No. It only converts units. Whether a particular weight or rate of gain is healthy depends on the baby's age, sex, history and growth curve, and that judgement belongs to your pediatrician, midwife or health visitor.

Guide

Baby weight in kg to lbs and oz: chart from 2 to 15 kg

Baby weights are recorded in grams or kilograms in most hospitals, and in pounds and ounces in most American and many British families. This chart translates between them.

By Buğra SözeriPublished October 17, 2026

The hospital wrote your baby's weight in grams, the grandparents want it in pounds and ounces, and the clinic's growth chart uses kilograms. This guide converts between all three. It is a unit conversion only. It does not say what any weight means for your baby's health; that is a question for the professional who knows your child.

The conversion factors

One pound is exactly 0.45359237 kg, so 1 lb = 453.59 g. One ounce is a sixteenth of a pound, so 1 oz = 28.35 g. To go from kilograms to pounds and ounces, convert to total ounces first, then split off whole pounds. Converting to decimal pounds and then treating the decimal as ounces is the most common mistake: 7.5 lb is 7 lb 8 oz, not 7 lb 5 oz.

Baby weight chart: 2 kg to 15 kg

Half-kilogram steps cover newborns through toddlers. Ounces are rounded to one decimal.

Kilograms	Grams	Pounds (decimal)	Pounds & ounces
2.0 kg	2000 g	4.41 lb	4 lb 6.5 oz
2.5 kg	2500 g	5.51 lb	5 lb 8.2 oz
3.0 kg	3000 g	6.61 lb	6 lb 9.8 oz
3.5 kg	3500 g	7.72 lb	7 lb 11.5 oz
4.0 kg	4000 g	8.82 lb	8 lb 13.1 oz
4.5 kg	4500 g	9.92 lb	9 lb 14.7 oz
5.0 kg	5000 g	11.02 lb	11 lb 0.4 oz
5.5 kg	5500 g	12.13 lb	12 lb 2.0 oz
6.0 kg	6000 g	13.23 lb	13 lb 3.6 oz
6.5 kg	6500 g	14.33 lb	14 lb 5.3 oz
7.0 kg	7000 g	15.43 lb	15 lb 6.9 oz
7.5 kg	7500 g	16.53 lb	16 lb 8.6 oz
8.0 kg	8000 g	17.64 lb	17 lb 10.2 oz
8.5 kg	8500 g	18.74 lb	18 lb 11.8 oz
9.0 kg	9000 g	19.84 lb	19 lb 13.5 oz
9.5 kg	9500 g	20.94 lb	20 lb 15.1 oz
10.0 kg	10000 g	22.05 lb	22 lb 0.7 oz
10.5 kg	10500 g	23.15 lb	23 lb 2.4 oz
11.0 kg	11000 g	24.25 lb	24 lb 4.0 oz
11.5 kg	11500 g	25.35 lb	25 lb 5.7 oz
12.0 kg	12000 g	26.46 lb	26 lb 7.3 oz
12.5 kg	12500 g	27.56 lb	27 lb 8.9 oz
13.0 kg	13000 g	28.66 lb	28 lb 10.6 oz
13.5 kg	13500 g	29.76 lb	29 lb 12.2 oz
14.0 kg	14000 g	30.86 lb	30 lb 13.8 oz
14.5 kg	14500 g	31.97 lb	31 lb 15.5 oz
15.0 kg	15000 g	33.07 lb	33 lb 1.1 oz

Birth weights in pounds and ounces to grams

Going the other way, here are common birth weights as they are announced in pounds and ounces, converted to grams and kilograms:

Pounds & ounces	Grams	Kilograms
5 lb 0 oz	2268 g	2.27 kg
5 lb 8 oz	2495 g	2.49 kg
6 lb 0 oz	2722 g	2.72 kg
6 lb 8 oz	2948 g	2.95 kg
7 lb 0 oz	3175 g	3.18 kg
7 lb 4 oz	3289 g	3.29 kg
7 lb 8 oz	3402 g	3.40 kg
8 lb 0 oz	3629 g	3.63 kg
8 lb 8 oz	3856 g	3.86 kg
9 lb 0 oz	4082 g	4.08 kg
9 lb 8 oz	4309 g	4.31 kg
10 lb 0 oz	4536 g	4.54 kg

Worked example: 3460 g at birth

Step one, grams to ounces: 3460 ÷ 28.3495 = 122.05 oz. Step two, divide by 16: 7 whole pounds use up 112 oz, which leaves 10.0 oz. So the announcement reads 7 lb 10.0 oz. For comparison, the WHO's low birth weight line of 2500 g is 5 lb 8.2 oz; we mention it only because it is the threshold you will see printed in that unit on many records.

Why the numbers on two scales don't match

A baby weighed at the clinic and again at home an hour later can show a difference of tens of grams, and that is usually not a conversion error. A feed, a wet diaper or clothing all change the reading, and home scales are typically less precise than clinic scales. Compare weights taken on the same scale, at a similar time relative to feeding, and in the same unit. Converting each reading to pounds and back adds rounding you don't need.

Our view: keep the record in grams, the unit the clinic uses, and convert only when you share it. If you need ounces for a recipe or a parcel rather than a baby, the grams to ounces converter does the same math.

Frequently asked questions

How many pounds is 3.5 kg for a baby?: 3.5 kg is 7.72 lb, or 7 lb 11.5 oz.
How do I convert a birth weight in grams to pounds and ounces?: Divide grams by 28.35 to get total ounces, then divide by 16. The whole number is pounds and the remainder is ounces. For example, 3460 g is 7 lb 10.0 oz.
What is 7 lb 8 oz in kg?: 7 lb 8 oz is 3.402 kg, or about 3402 g.
Is this chart medical advice?: No. It only converts units. Whether a particular weight or rate of gain is healthy depends on the baby's age, sex, history and growth curve, and that judgement belongs to your pediatrician, midwife or health visitor.

Sources & references

Authoritative references cited by this piece. Verified by Buğra Sözeri on the dates shown and re-checked at every deploy.

NIST — US customary and metric conversions — The pound as exactly 0.45359237 kg under the 1959 agreement(as of 2026-10-17)
WHO — Low birth weight — WHO definition of low birth weight as under 2,500 g(as of 2026-10-17)
WHO — Child growth standards — The reference weight-for-age charts used by many pediatric services, published in kilograms(as of 2026-10-17)