baby playpen mattress

Sizes vary by model, but common lengths run from about 38 inches for mini/portable playard mattresses up to roughly 52 inches for standard crib/toddler mattresses; widths are typically between about 24 and 28 inches. Thickness depends on intended use, with portable/pack-and-play options often from about 1.5" up to 4" and standard crib/toddler mattresses commonly around 5" to 5.5".

Listings show several common constructions: memory foam and gel-infused memory foam cores, high-density foam cores, polyester fiber batting cores, and innerspring/coil constructions (including Bonnell coils or other innerspring units). Each core type affects feel, support, and weight.

Compressed foam or memory foam mattresses typically take about 24–72 hours to fully expand, with many listings recommending 48–72 hours for best results; actual time depends on the foam type and room temperature.

Many models use a dual-sided design with a firmer infant side and a softer toddler side; other listings note two-sided constructions with similar firmness on both faces for easy flipping as the child grows.

Portable/pack-and-play mattresses in these listings generally range from about 1.5" to 4" thick, while standard crib and toddler mattresses are usually around 5" to 5.5" thick.

Descriptions highlight breathable knit or Tencel/Lyocell covers, high-breathability or open-air constructions for airflow, and cooling layers such as gel-infused memory foam to help dissipate heat; many also include removable, washable covers.