Child stroller apparatus and child seat suitable for use on the same

A child seat comprising:

• a seat frame including a first frame portion having a side coupling part, and a second frame portion pivotally connected with the side coupling part, the first frame portion and the second frame portion being rotatable relative to each other for unfolding and collapsing the child seat;
• a tray pivotally connected with the side coupling part, the tray being rotatable relative to the side coupling part;
• a tray latch pivotally connected with the side coupling part, the tray latch being operable to engage with the tray for locking the tray to the side coupling part and disengage from the tray for rotation of the tray relative to the side coupling part;
• and
• a linking member operatively connected with the tray latch and the second frame portion, wherein a rotation of the second frame portion for collapsing the child seat causes a movement of the linking member that urges the tray latch to rotate relative to the side coupling part and disengage from the tray.