A pen for washing a small child, intended for use in a shower or bathtub. The floor panel is flat, resilient for the comfort and safety of the child, and perforated to allow water to flow through. The upper frame assembly provides a handrail too high for the child to trip, fall, or climb over, but low enough for the child to comfortably hold itself upright or pull itself to a standing position. Smooth, perforated side panels allow free flow of water while safely confining the child to the interior of the pen. For use in bathing, the pen relies on the surrounding bathtub to hold water. For use in showering, the pen retains no water. The pen may be collapsible for easy storage.