The size chart for children’s knee-high socks is usually based on the child’s height (cm) and approximate hip circumference:

About order/product collection or delivery options/timeframes:
⭐ 0.00 EUR: Collection at our store "BĒBIS" in Riga, Mārupes Street 8d (Āgenskalns) – items can be collected immediately if in stock (please wait for our confirmation);
⭐ 1.99 EUR (LV): Collection via UNISEND, VENIPAK, or PASTS parcel lockers (free for orders over 30.00 EUR); delivery within 1–3 business days;
⭐ 2.49 EUR (LT, EE): Collection via UNISEND, Udrop, or LPExpress parcel lockers; delivery within 2–5 business days; 
      LT, EE: 2.49 EUR – collection via UNISEND, Udrop, or LPExpress parcel lockers; delivery within 2–5 business days;
⭐ 2.49 EUR (LV): Collection via DPD parcel locker (free for orders over 30.00 EUR); delivery within 1–3 business days;
⭐ COURIER – the cost depends on the weight and dimensions of the items. Once we receive your order, we will calculate the courier delivery fee and inform you; delivery takes 1–3 business days. 
      LT, EE: Home delivery. Upon receiving your order, we will calculate and inform you of the courier delivery cost, as well as the estimated delivery time.

In any case, when processing your order, we will calculate and provide details on all available delivery options, ensuring you have comprehensive information and a range of choices.