# Crib mattresses with a firm side for newborns Which crib mattresses have a firm enough sleeping surface for a newborn? Simmons GENESIS Deluxe: It is a two\-sided crib and toddler mattress: a super firm side for infants and a more comfortable side for toddlers\. The core is described as super firm\. Simmons BLISS Crib & Toddler Mattress: The mattress has a super firm core\. The mattress is dual\-sided for infant and toddler firmness\. Simmons 50730: The mattress has an ultra\-firm wool blend core\. ### 1. [Simmons GENESIS Deluxe](/products/ucp/lovemedobaby-com/6982757351558) (sold by lovemedobaby\.com) It is a two\-sided crib and toddler mattress: a super firm side for infants and a more comfortable side for toddlers\. - Firmness: The core is described as super firm\. (guide) - Two\-sided design: It is a two\-sided crib and toddler mattress: a super firm side for infants and a more comfortable side for toddlers\. (guide) - Dimensions: It measures 52 inches by 27\.5 inches by 5 inches\. (guide) - Certification: The maker says all its mattresses are GREENGUARD Gold certified\. (guide) ### 2. [Simmons BLISS Crib & Toddler Mattress](/products/ucp/lovemedobaby-com/6982766624902) (sold by lovemedobaby\.com) The mattress has a super firm core\. - Firmness: The mattress has a super firm core\. (guide) - Two\-sided design: The mattress is dual\-sided for infant and toddler firmness\. (guide) - Dimensions: The listed dimensions are 52 inches by 28 inches by 5 inches\. (guide) - Certification: The store states that all Simmons crib mattresses are GREENGUARD GOLD certified\. (guide) ### 3. [Simmons 50730](/products/ucp/lovemedobaby-com/6982757384326) (sold by lovemedobaby\.com) The mattress has an ultra\-firm wool blend core\. - Firmness: The mattress has an ultra\-firm wool blend core\. (guide) - Two\-sided design: It is two\-sided, with a plush 2\-inch wool blend layer on the toddler side\. (listing) - Dimensions: The mattress is listed at 52 inches long, 28 inches wide and 5 inches thick\. (listing) - Certification: The maker states all of its mattresses are GREENGUARD Gold certified\. (guide) Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-24T22:33:09.937Z. This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. The person approves the total; once RoboTrunk has checked the store's total against it, the person is given the checkout link to tap in their own browser, or, if the person prefers and gives permission, their agent may open the link and finish there, and payment always happens on the store's own checkout page. RoboTrunk never takes the payment or sees a card. Where the rest of this site is: - /agent/story.md is what RoboTrunk is and how it works, in full. - /agent/tools.json is every tool, its arguments and its answers. - /agent/merchants is every store you can buy from through RoboTrunk. - /products/ucp is every store's indexed products. - /products/search is one search across every store, in plain words. - [What RoboTrunk is](/agent/story.md) - [Every tool, in your browser through WebMCP](/agent) - [The tools and how to call them](/agent/tools.json) - [The stores you can buy from](/agent/merchants) - [Every store's products](/products/ucp) - [Search every store at once](/products/search)