Alpha - believed to be the third biggest baby born in the UK with a weight of 14lb 15oz. See SWNS story SWBRbaby. A mum has given birth to a whopping 14lb 15oz baby - believed to be the third biggest newborn in the UK. Cherral Mitchell, 31, needed two midwives to haul out big Alpha before he left staff shocked when he tipped the scales. Nicknames such as 'Butter Bean' and 'Baby Hippo' have since floated as it's believed Alpha is the third heaviest baby to be born on British soil. Cherral said: "We didn't think he was going to be that big.