Nike often has several different versions of their adult sneakers, and these are categorised by whether they are TD, PS or GS.
Sneakers with 'TD' in the product name/description are made for Toddlers. These run from a UK 1.5/EU 17 to a UK 9.5/EU 27.
Sneakers with 'PS' in the product name/description are made for Pre-Schoolers. These run from a UK 10/EU 27.5 to a UK 2.5/EU 35.
Sneakers with 'GS' in the product name/description are made to for Grade-Schoolers. These tend to fit adults with a smaller foot, and we would advise taking half a size up if you are an adult purchasing a 'GS' sneaker. These run from a UK 3/EU 35.5 to a UK 6.5/EU 40.