My son is now figuring out how to climb in and out of his booster seat without any help. He makes for stools, chairs, and other furniture with gusto. He climbs playground equipment that months ago was just a jumble of unapproachable logs, ropes, and steel bars. He is climbing. Once he gets to the top, often with assistance, he does not yet have the requisite skills to get back down, so climbing is usually more of an upward thing than down. My sweating and nervous spotting of him makes sure that the downward path is not abrupt and dangerous. I suppose all instances of letting go before I think they are really ready will include some form of worry. Later, however, I just won’t be able to catch them when they fall.