Important: for babies of up to 5 (kg) the diaper sizes are marked as NB (Newborn).
The weight categories of the adjacent sizes intersect with each other and its better to choose the bigger size. For example, with 7 (kg) weight it’s better to choose M, that matches the weight of 5-10 (kg).
Baby body complexion, as one of the size determining criteria:
Individual baby features lead to more detailed choice of a diaper, as the weight shows the approximate size only.
For example, the weight of a thin and tall baby and a short and chubby baby may be the same, but the size for the first baby might be smaller, as their leg girths are different. In case of thin legs the size should be smaller.
Important: for chubby babies that reach the next weight category, for example, with 11 (kg) weight, the L size may be chosen.