Makers shouldn't show that a surrogate becomes attached to the child cos they carry it and then claim as their own. I understand the bond is natural when you have a baby growing in you, it's attached to you but to me nayi soch will be that Naina rightfully gives the baby to Rehaan.
I doubt this will happen and knowing tv world, poor Rehaan will die and Naina and Raghav will keep the baby.