I have the SIt and STand LX from baby trend for my two children.  They are sixteen months apart.. When my daughter was first born my on would sit in the seat in back and I would put her car seat in the seat infrom with the bar you add for it.  I loved using it this way.  Now that she will be one in a few days she sits in the seat.  As my son is a very large two year old i had to convert it to the stand part. He like to sit on the little seat facing me and sometimes he likes to stand.  I love everything about it except fot the fact that it is an ugly brown.