bayjayy, he could be slower than the rest and needs no help... just sat in a cool spot in your bator or his membrane could be beginning to shrink wrap and therefore cannot break the shell because the wrap is constricting his movement inside.
To check inside, you can break a hole about the size of a pea on the top of the air cell. Be sure to candle to avoid puncturing baby. Use a drill bit or eyeglasses screwdriver. Carefully score entry point and slowly apply pressure to break through shell. Use tweezers and cuticle nail scissors to chip teeny pieces away and cut outer membrane. Shine flashlight to see inside. If all looks ok, then quickly put him back in bator and add hot water to sponges to steam it up. If baby looks stuck, make the hole the size of a quarter, mist membrane and take picture to post.