It's exciting to shop for baby clothes, nursery decor and cool baby gear.When it comes to shopping for a crib mattress though,it's not that exciting.However, considering the fact that babies spend up to 16 hours a day sleeping on a crib mattress-it is perhaps one of your most important baby nursery purchases. With so many options out there and with most of the mattresses looking identical on the outside, how do you pick the best baby crib mattress?Here's my indepth guide to picking a baby mattress. Since I frequently get asked about my favorite picks for best crib