This achievement requires that you jump to catch a falling baby. You will most likely obtain this one by accident. Babies are the little squirrels that you must collect on the last level of each season of a year. If you are having trouble, try loading up the last stage of Year 1, Autumn. Wait around near the middle of the lowest tier of the stage (to the right of where you start). Soon several babies will begin falling down to your level. Just try and jump to intercept one before they hit the ground. This should only take a couple of attempts or less.