A baby girl, weighing 12lb 9oz is Britain's biggest ever baby girl, although the mother is only 5ft 2in

Farrah, the newborn daughter of Karen Gallacher, is twice the weight of an average baby and has already outgrown her newborn nappies, also wearing clothes apt for a 3-month-old.

"Neither me or Robert were big babies so Farrah's arrival was a complete shock," the Daily Mail quoted Karen as saying.

"She is very special but we didn't even realise that she was Britain's biggest baby girl until Robert's family looked it up on the internet. I never imagined people would be this interested.

"Everything's been turned upside down since she arrived. I usually keep the house neat and tidy but there's stuff everywhere now that she''s here," she added.

Karen had to be induced thrice before the huge caesarean was born but doctors have also said that she may not end up being any bigger than normal kids.

"They took me into the hospital on August 6, because they knew she was going to be a big baby - but obviously not this big.

"After trying to induce me three times there was no movement so I had to have a caesarean.

''It was a very normal pregnancy. I wasn't craving any odd foods or anything.

"It wasn't until 36 weeks that I realised she was going to be big. I went for my check up and they measured me at being 36cm instead of 42cm.

"Even then I didn't really realise how big I was until I looked at photos from before she was born - I was massive," she added.