Ordered that the order is affirmed insofar as appealed from, with costs.
The Supreme Court properly denied those branches of the plaintiffs motion which were, in effect, to vacate the child support provisions of a stipulation of settlement entered into by the parties on March 24, 1999, which was incorporated but not merged into a judgment of divorce, on the ground that those provisions did not comply with Domestic Relations Law § 240 (1-b) (h), and to recalculate child support de novo. A postjudgment motion in a matrimonial action is not the proper vehicle for challenging the propriety of child support provisions contained in a stipulation of settlement incorporated but not merged into a judgment of divorce ( see Barony v Barany, 71 AD3d 613; Thelander v Thelander, 42 AD3d 495, 496; Luisi v Luisi, 6 AD3d 398, 401). A challenge to such a stipulation must be made by the commencement of a separate plenary action to set aside the stipulation ( see Barany v Barany, 71 AD3d 613; Thelander v Thelander, 42 AD3d at 496; Luisi v Luisi, 6 AD3d at 401).