My sister and her 20 month old cruised on the Spirit last year. She was not able to use the child care facility. They are strict on the 2 year old age limit. They also would not allow her to use the facility even if she stayed to supervise. However, the Spirit had a smaller wading pool next to the larger kids pool area and everyone was using it with the swim diapers.
She had an inside cabin and decided to have her child sleep on the floor since he was still rolling off of normal beds. It worked out fine. They would visit our cabin which had a balcony. We would babysit and just lock the balcony door. We took a smaller type stroller. Handy for both the excursions and to get around the ship. We had a great time but we wish we could have used the child care facility for an hour or two each day. Are you on the Sun repositioning cruise next week?