im sorry my computer was broken and just got a new one so I apologize for the delay I thought I had already answered this response.....yes it will fit someone 5'4 that is on the thinner side
well im 5'3 / 5'4 but much heavier than i was at 25 im almost 50 so NO would b the answer to me getting n this onesie but i did hold it up to me and the length is there but no way covering the front or back....lol if u r a 100/110lb at those heights then i am betting u would b comfy as well