An infant stroller apparatus includes a front leg frame having a first side segment, a handle frame having a second side segment pivotally coupled with the first side segment via a first pivot connection, a rear leg frame having a third and a fourth side segment pivotally coupled with each other via a second pivot connection, the third side segment being further pivotally coupled with the first side segment via a third pivot connection, and the fourth side segment being further pivotally coupled with the second side segment via a fourth pivot connection, a seat portion pivotally coupled with the first side segment via a fifth pivot connection, and a support frame portion respectively coupled with the seat portion and the fourth side segment.