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Question: Peg perego Pliko P3

I think I love this stroller but I have concerns and theirs nothing better than to hear feedbacks from experience parents, Im a first time mom and I want to now for example if my newborn wants to take a nap is the stroller by it self without the carseat a safe, confortable place for her to rest? For how long im going to be able to use the carseat (age wise), is the stoller an easy to use one after the baby is done with the carseat?!?!?!