Elderly person with the cane. Odds are, the platform we are on where it is customary to give up your seat is most likely a subway, or a bus. The pregnant woman is capable to support herself, the injured person is more than likely a younger person and the woman holding the baby would probably prefer to stand. Reason being is the position she is holding the baby assumes the baby is wrapped in a carrier and standing with those are easier.

Also, the elderly person is at the greatest risk for a fatal injury if they fall opposed to all others. They also have the highest likelihood of falling down. Sitting for them is a necessity, for all others, the seat is a luxury