I see no reason why a typically functioning 6 or 7 year old can't use the mens room. If you are stating you can't enter the ladies room because you have an infant and wheelchair bound 4 year old, how do you go? I assume the wheelchair must be motorized, because you can't push a stroller and a wheelchair at the same time. According to your posts, it seems like you have a baby, a wheelchair bound 4 year old, a 6 year old, and a 7 year old, plus an older child. I still can't see a reason why your 6 or 7 year olds can't use the mens room, or why you can't come with them into the ladies room, since you claim you all go together when everyone has to go.