Innerspring mattresses are sometimes confused with hybrids because they both have coiled cores. Their similarity ends there for the most part. Innersprings have thinner comfort systems, so pressure relief is sometimes marginal. This isn’t as much of an issue for young children since they need a solid surface for safety reasons. As your child grows, a bed with thicker comfort layers may be necessary to provide sufficient cushioning.  Since the space between coils promotes airflow, innerspring mattresses usually have excellent temperature control.