in a Dilemma

this happened in a MRT...
3 ladies sitting together, when a rather plump lady with BIG tummy boarded the train walked toward their direction and stood in front of them. 3 of them r raring to give up their seats to the elderly, the pregnant, small size kids but this lady who's standing in front look either she's BIG SIZE or she's 6 months pregnant. They're unable to tell and if she's nt pregnant and seat is given to her, won't she feel embarrass? hmmm and if she's pregnant and they do nt give up their seat, they'll b regard as selfish SINGAPOREAN!!! argh, in the end nobody give up until other passengers alight then she got herself a seat. Will u give up the seat even thou she's nt pregnant but has a big tummy? If she's with her friend, won't she feel terrible that someone is giving up a seat thinking she's PREGNANT!! tat's such a terrible insult to that lady...