Population of young children in the UK 1971-2022, by single year of age
As of 2022, the population of young children aged between 0 and 4 years old in the United Kingdom was estimated to be just under 3.58 million, with 694, 286 under 12 months old, 690,494 at age one, 717,451 aged two, 733,702 aged three, and 743,637 aged four.