A mum says strangers are left gobsmacked when they see her baby boy - who already wears clothes meant for three-year-olds. Alexa Priego, 31, gave birth to baby Kason 11 months ago - but his size often fools people. Her youngest son was born at a normal weight of 7lb 14oz but, after two months of breastfeeding, he became huge - and just kept growing. Alexa, a mum-of-three from Manhattan, New York, said people often stop her in the street because they're stunned by his size. Now 11 months old, he weighs the same as a two-year-old and fits in clothing for three year olds. Alexa, a hospital administrator, said: "He is the heaviest baby in the whole world. "He's very tall and very chunky - doctors said he is in the 99th percentile for weight and height. "When people see him they ask his age, and they are shocked when I say 11 months because they expect him to be older. "People are so amazed by it - but when my daughter was born, she was exactly the same. "I guess I just make big babies!"