Sealy Ortho Rest Extra Firm Waterproof Baby Crib Mattress & Toddler Bed Mattress, 150 Premium Coils, Orthopedic Airy Comfort, GREENGUARD Air Quality Certified - Made in USA, 52"X28" : Amazon.ca: Baby
Dream On Me Orthopedic Standard Crib Mattress, Extra Firm Foam | Walmart Canada
Kolcraft BabyPedic Bubbie Extra Firm Coil Waterproof Baby Crib Mattress and Toddler Mattress, Airy Comfort, Greenguard Air Quality Certified - Made in USA, 52"x28" : Amazon.ca: Baby
SIMMONS 100% BREATHABLE 2-Stage SUPER FIRM Crib Mattress | Babies R Us Canada