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Babies Weight

As health professionals we use weighing babies only as a quick guide (a screening tool) to confirm growth

Lets see some facts about weighing babies

The average birthweight of a term baby (37-40 weeks) is between 2,500-4,000g. Birth weight is a marker of intrauterine environment. These markers include

length of pregnacy

size of parents

birth order (first borns are usually lighter than subsequent siblings)

Mum’s health in pregnancy

Baby’s health in pregnancy

Fact 1. Birth weight does not relate to projected growth

We do not plot birth weight on growth charts until baby is 2 weeks old, partly for this reason

Fact 2. Baby’s usually loss 7-8% of their weight in the first 3-5 days

Because once they are born they are no longer floating in fluid, so they will loss some fluid. They feed on colostrum for the first 3 days- their first immunisation, they get small concentrated quantities until the milk comes in

Fact 3. Most regain (80%) by 2 weeks of age

If they don’t it is an indication for us to work together to ensure your milk supply is adequate and your baby is able to feed well

Fact 4. Average weight gain from

0-3 months 150-200g/week

3-6 months 100-150g/week

6-12 months 70-90g/week

these figures are guides only

Fact 5. People are never all going to be the same height thats why we have % charts.

50% will be average (not a pass!), 3% of us will be small, 3% will be bigger etc

Growth charts show us if serial measurements indicate smooth growth ( follow a certain percentile line). Many babies cross percentile lines in the first 6 months because their birth weight is no indication of their future growth

If you want to discuss this further please contact me

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