What is the average baby weight in the UK?

When considering the average weight of a new-born baby, we assume that the baby is delivered after a regular pregnancy length (9 months). The average weight of a baby is 7lb 8oz (3.4 kg) for boys and 7lb 4oz (3.3 kg) for girls. 

What is the average baby weight per month?

Babies gain a lot of weight in the first year. On average, baby boys gain 13.4lb (6.1 kg), and baby girls gain 12.6lb (5.7 kg) in the first year. Because of this, it's very important to monitor the babies weight frequently. In the overview below you can find the average baby weight per month.

 Age   Average baby boy weight   Average baby girl weight 
 0 month   7.5lb (3.4 kg)  7.3lb (3.3 kg)
 1 months   9.7lb (4.4 kg)  9.6lb (4.3 kg) 
 2 months  12.3lb (5.6 kg)  11.7lb (5.3 kg)
 3 months  1st 0.1lb (6.4 kg)  13.2lb (6 kg)
 4 months  1st 1.4lb (7 kg)  1st 0.6lb (6.6 kg) 
 5 months  1st 2.5lb (7.5 kg)  1st 1.7lb (7.1 kg)  
 6 months  1st 3.4lb (7.9 kg)   1st 2.5lb (7.5 kg)
 7 months  1st 4.3lb (8.3 kg)  1st 3.4lb (7.9 kg)
 8 months  1st 5lb (8.6 kg)  1st 4.1lb (8.2 kg)
 9 months  1st 5.6lb (8.9 kg)  1st 4.7lb (8.5 kg)
 10 months  1st 6.1lb (9.1 kg)  1st 5.4lb (8.8 kg)
 11 months  1st 6.7lb (9.4 kg)  1st 5.8lb (9 kg)
 12 months   1st 7.2lb (9.6 kg)  1st 6.3lb (9.2 kg)

The numbers in the above table are averages, so it's very normal if your babies weight is somewhat lower or higher. If you don't trust your babies weight, it's wise to contact a GP.

Are baby boys heavier than baby girls?

On average, baby boys are indeed heavier than baby girls. New-born Boys are about 0.2lb (100 kilograms) heavier than new-born girls. After 12 months, the average baby boy weight is about 0.9lb (400 kilograms) heavier than the average baby girl weight. 

Is the second baby usually heavier than the first baby?

Yes, the second baby is often heavier than the first baby. On average the second baby is 0.4lb (200 kilograms) heavier than the first child. Of course there are always exceptions, whereby the first baby is heavier than the second baby.

What is the average weight of new born babies in other countries?

There is certainly a difference in the average weight of new born babies in various countries. A person’s physique plays an important role and differs per region. The average weight of babies in Asian countries is for instance a lot lower than in the UK. This is because Asians are often smaller than British.

How much did the heaviest baby ever weigh?

The heaviest baby ever was born in Canada in 1879, and weighed 23lb 12oz! This is more than 15lb heavier than the average English new born. The mother of the baby had gigantism and died 11 hours after giving birth. The heaviest baby born to a healthy mother was a boy who weighed 22lb 8oz. The UK’s heaviest naturally born baby, George, weighed 15lb 7oz and was born in 2013. The heaviest baby ever born in the UK was born in 1992, and weighed 15lb 8oz.

See besides average baby weight also:
Average Baby Length
Average Child Weight
Average Weight of a man
Average Female Weight