I second the carrier method as I sometimes out w less than 6 month old baby by myself for more than half day and I just wear the baby w me every where including the toilet. If I were u, I would look out and use the handicap toilet whenever possible so that baby and boy can go in with me without feeling squeeze. I believe there will be kind souls in the toilet if u really need, they can see the stroller (if u bring that) and ur 5yo outside ur cubicle (in case u need longer). All the best! There's always a first time
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