All brands having their own specific size guides and you will likely know from experience which brands are bigger / smaller / fit your child’s build best.
Therefore we list items according to what their label states.

Most garments are labelled with an age range 3-6 Months / 18-24 Months / 3-4 Years however some are labelled with a single age 6 Months / 24 months / 4 Years.

Therefore an item labelled:
6 Months is listed in 3-6 Months
24 Months is listed in 18-24 Months
4 Years is listed in 3-4 Years

We are of course happy to provide measurements or our opinion on the size of any specific item.