Are there any nice sized diaper bags that would be good for a one year old and a newborn that you could recommend?

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I'm having a hard time trying to figure out what to do. My daughter just turned one in September and I'm due December 6th with another baby girl in a few weeks. Should they each have their own diaper bags? Or is there a nice big one that you would recommend I use for the both of them? Idk what I should do. What bags do you like or recommend?