Although memory foam is often used for toddler mattresses, it can provide a warmer sleeping surface. This may lead to overheating, especially for babies and young toddlers.
Memory foam also tends to be higher in chemicals and release more unhealthy toxins (source).
If you’re looking for the comfort of a memory foam mattress for your toddler, search for one that’s firm and breathable. Some are made with gel beads or other cooling technologies that can help prevent overheating.
Look for mattresses that have been certified to be low VOC and safe from other harmful chemicals.