A baby's first words are often considered a memorable stage in a child's development, but one baby decided to give his mum the shock of a lifetime by coming out with a series of expletives.

The footage, captured at a home in London on Wednesday, shows the foul-mouthed baby first saying 'sh**', then 'd***head', maintaining a naively innocent face throughout, and causing his mum to erupt with laughter.

According to his mother, baby Luca was being taught the names of his parents when he decided instead to start swearing.