You can push down on the mattress and see how much your hand sinks into the mattress to check the firmness. However, a crib mattress sold in the U.S. will meet the federal safety standards, which include a maximum measure of how much a baby can sink into the surface and still be safe. All of the crib mattresses will be relatively firm to your adult senses. That's OK. Babies have been sleeping just fine for decades on what might feel like a rock to you.
Foam or coils? It doesn't really matter. Foam crib mattresses are usually less expensive than coil mattresses, and are just as safe, as long as they aren't too soft. Again, the firmness is regulated by the safety standards, so you won't find vast differences.
Greenbuds Primrose Pureté ™ 2 in 1 Crib Mattress is designed with your child's health, safety, and comfort in mind. The inner mattress core consists of 3" of the purest all natural coconut coir, providing a very firm support layer for infants, while another 1" layer of all natural latex acts as a firm yet more conforming sleep surface for your active toddler. The latex and coconut coir are encased in an Organic Cotton Quilted Cover, which is removable, washable, and interchangeable. Mattress…