I used a waterproof crib pad thing - actually 2 of them s I could wash 1, use the other. it was heavy enough not to bunch and kept the bed clean through spit-up and diaper leaks. Thjese days, I don't use anything b/c we haven't seemed to need it.

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Teresa (34)
Wife to Mike (33), mommy to four boys:
Tyler (14), Mason (9), Bradley (8.5) and "Baby" Logan (2)