When you should move to the next size

All babies do not have the same physique and development and as they grow, their body structure varies even more. So, we choose diapers according to the baby's physique, its weight rather than its age and that's why diaper sizes overlap in kilograms.

If you are worried about the signs that will tell you when to move to the next size, here is a list: 
•    Sudden leaks. If you had no problem with the diaper you were using so far and suddenly you have frequent leaks, this probably means that your baby has grown and has more urine. 
•    When worn, the diaper must cover the baby's navel. If it falls under the navel, then it is too small and will need to move to a larger size.
All diapers in the market, come in sizes ranging in kilos and these overlap. This because the body structure of every baby (e.g. taller or thinner etc.) may be of the same weight, but have different fit on different babies.