S Chest - 52cm (all around), 20inches all around

     Length - 39cm (all around), 15.5inches all around

Fits up to approximate size of 10months, depending on baby's size & weight.

M - Chest - 56cm(all around), 22inches all around 

        Length - 42cm, 16.5inches 

fits up to approximately 18months, depending on size of baby

Baby/kid age is an estimation of fit, not all babies/kids are of the same size, so please keep in mind dimensions of clothings, rather than age groups for a more accurate fitting