芬兰采购需求：婴儿汽车安全座椅、婴儿提篮、汽车安全座椅、增高座椅、婴儿安全座椅、婴儿汽车安全座椅

I hope you're doing well. We have an old child car seat that we're currently using, but we're a bit uncertain about its safety and longevity. It's important for us to know how long we can expect this seat to remain effective for our child's protection. Could you provide us with some guidance on the typical lifespan of car seats like this? Additionally, if there are any specific signs we should look for that indicate it's time to replace the seat, please share those as well. We want to ensure we're making the safest decisions for our child, and your expertise would be greatly appreciated in this matter. Looking forward to your insights!