I will soon be travelling alone with my two daughters (2.5 years old and 6 months old) from Sao Paulo-LHR/ LHR-Edinburgh with British Airways. Would it be inappropriate if I change their non-poopy diapers over a changing pad on my seat (I assume we will get bulkhead seats since the baby will have a skycot)? I am not sure if I could manage both of them in the plane's bathroom without help.