Size 90 in baby clothes can vary depending on the brand and country. Here are some size charts that provide information on what size 90 typically means:

• According to Nordstroms size chart, size 90 cm is equivalent to a US size 18-24 months.
• What to Expect states that size 90 in Europe is about a size 2T in the US, and should fit a toddler who weighs between 26 and 33 pounds or up to a height of 36 inches.
• Kiwi Sizing provides a similar conversion, stating that size 90 in childrens clothing is equivalent to 2-3 years in US/UK sizes, and the average weight for a child of this size is between 16-20 lbs and the height is between 26-28 inches.
• Hanna Anderssons size chart lists size 90 as equivalent to a US size 12-18 months, and should fit a baby who weighs between 16-20 lbs and is up to 28 inches long.
• Amazon provides weight ranges for each size, stating that size 90 is suitable for a baby who weighs between 21-24 lbs.

Its important to note that these size charts are general guidelines, and its always best to refer to the specific brands size chart for the most accurate sizing information.