I started in telecommunications back when a crank on the phone had to be turned before asking the telephone operator to connect a call. The common seahorse is classified as Hippocampus hudsonius of the genus Hippocampus in the family Syngnathidae.
the extra width and length added on to the crib mattress size is to allow for drape some commercial blankets are smaller for instance at about 35 inches by 45 inches whether a smaller or larger blanket is used depends on the parents for example a larger blanket covers more of the crib but a smaller blanket is easier to pick up with the baby
The chart below gives the sizes in inches and meters for the four main types of mattresses sold in most of the Western world. The other size you might want to know for knitting is the size of cribs, which can vary in size but usually have a mattress around 28 by 52 inches. Standard Matress Sizes.