I know what you mean! I'm thinking the same thing. How is it possible for the baby to be perfectly fine when she just went through a bomb explosion? And btw, since she doesn't remember anything post moving to Mumbai, does this mean, she doesn't know that she's carrying her BIL (which i still don't think that its Jai's baby btw) child? She doesn't know how many problems she's caused between her sisters, between Jai and Bani. it's going to be interesting to see how it all plays out.
However, at the same time, for some reason, I think she hasn't lost her memory. I think after she found out that Bani had been looking after her health without her knowing, she's felt guilty of all she's done to her sister, she's trying to get back into her good books so now she's gonna act like she's lost her memory and has no idea whats happened. I think this is Pia's way of getting the love and attention she knows that Bani and Rano will give her.
I don't for a minute believe that she's actually really lost her memory or she doesn't remember anything that she's done!
Anam