May i know if baby need to be able to sit up unassisted to be in an exersaucer? My lo 5mo+ can sit up but supporting her body with both her arms tripod position...is she ready to be in exersaucer?

Better not as exersaucer is supposed to entertain the young ones who are able to, at least, sit up by themselves. It is ok to let ur 5 mth old sit in for a while but not for v long. That's my personal opinion.