My experience - pH probe on a 3 month old - easy enough, on a 3 yr old - total nightmare!
He did pull it out in the early hours of the morning so we probably only had about 18 hours actually recorded.
Honestly, if doing a probe on an older child I'd ask to stay in hospital because trying to stay with the kid for 24 hours is impossible.
Barium swallow is hard if they spit it our everywhere or refuse to drink it but they can put an ng down and put it through that if needed.
Doing a barium swallow in a 3 month old was hard because he wasn't happy to drink anyway, 18 month old was a total screaming nightmare, 6 year olds not bad at all because you can bribe them but even that didn't work for Thomas aged 5 1/2 where it took 2 trips, an ng and him tied to a plank to get it into him. And after all of that the surgeon scoped him anyway - if he'd done that to start with then we wouldn't have needed to put him through the trauma.
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Eleanor, Mummy to -
William, Nicholas and Thomas