Nine months later, Jeetu and Naina give birth to a baby girl, while Karan and Poorvi welcome a baby boy. Chaos ensues when both couples discover the mix-up.

Due to a hungover lab technician who swapped vials during an office Diwali party afterglow, the embryos are reversed. Varun & Riya unknowingly get Kabir & Tara's child. Kabir & Tara get Varun & Riya's.

Due to a laughable medical mix-up, the sperm samples of the two husbands are swapped. Varun’s child is growing inside Monika, and Honey’s child is growing inside Deepti. The rest of the film is a chaotic, emotional, and hilarious journey of the couples deciding whether to keep the babies, "swap partners" (in a clinical sense), or start over.