Rotational joint and product for children having the same

A rotational joint, for a rotational connection among at least three support rods, one of the support rods being a base rod having a base, and the rest of the support rods comprising a first rod having a first connecting base and a second rod having a second connecting base, the first connecting base, the second connecting base and the base being rotationally connected about a same rotation center line, wherein the rotational joint further comprises a linkage member, and the linkage member is arranged in such a manner that the linkage member is capable of only linearly moving relative to the base;

• one of the linkage member and the first connecting base is provided with a first guide slot, and the other one is provided with a first guide pillar, and the first guide pillar is capable of being relatively slidably inserted in the first guide slot;
• one of the linkage member and the second connecting base is provided with a second guide slot, and the other one is provided with a second guide pillar, and the second guide pillar is capable of being relatively slidably inserted in the second guide slot, wherein, an extension direction of the first guide slot and a linear movement direction of the linkage member are not parallel or collinear with each other, and an extension direction of the second guide slot and the linear movement direction of the linkage member are not parallel or collinear with each other.