Age is useful context but a poor measurement for selecting a car seat. Before booking in Prague, record the child's standing height and current weight, then check the exact restraint's label and manual. Czech legal thresholds determine when a restraint is required, while the product limits determine whether a particular seat may be used. Both sets of rules matter.
Measure before travel
Measure without shoes on a level surface and weigh the child in light clothing if possible. Record the date because infants change quickly. For a seat already in use, also note harness fit, head position, and any model-specific standing or seated height marker. Do not round down to remain inside a limit or select a larger stage for future value.
Read the approval label
UN R129 seats usually specify a stature range and may include a maximum mass. ECE R44/04 seats use weight groups. Sale and continued-use rules differ, so verify current Czech and EU guidance. The label also identifies the approval and model information, but the manual explains direction, inserts, belt route, ISOFIX, support leg, top tether, and vehicle restrictions.
Perform the fit check
For a harnessed seat, the child should sit in the intended posture with straps flat, correctly positioned, and snug, without bulky outerwear. For a booster, the vehicle lap belt belongs low on the hips and the shoulder belt across the chest and shoulder. The child must remain upright. Passing a legal threshold does not guarantee that an adult belt fits well.
Send useful rental information
- Child's exact height, weight, and age.
- Rear-facing requirement and current seat type.
- Vehicle make, model, year, and seating position if known.
- Number of restraints across the row.
- ISOFIX, top-tether, or support-leg constraints.
Recheck the label at pickup. A provider's category name cannot override the manufacturer's limits.
Keep the measurements with the booking confirmation for pickup.