It's not a good idea to constantly be removing carseats.
Even infant seats.

Each time it's taken out, there's a greater likelihood it won't be reinstalled properly or as tightly.
Plus, car seats are largely made of plastics. Cracks and warps can happen with force and the elements. Think of how many parents bring in their carseat to the grocery store and plop them in carts. I've seen so much damage on the bottom of infant seats from shopping carts! One little piece of broken or wedged plastic can prevent that carseat from latching properly to it's base.

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