I use the height as an estimate for the size of clothes I buy, because even between brands/manufacturers, the sizing’s different. When in doubt, buy a size that’s slightly bigger.. heh. At least the LO can grow into it
Buy according to size, such as 90cm is usually 18 months to 24 months. Then refer to measurements to see, cause some cutting might runs small. Other than that, do not usually ask for ptp measurements.