Kundalis and babies

Kanji has handed his baby to Chagan and Reva in a hurry before being apprehended by the police.

He has now come looking for the baby.

Chagan and Reva had three daughters, one of which seems to be Kanji's baby. It cannot be Monghi as she is too small. So it has to be either Santu or Khemi.

Nanaji seems to know that truth and is hiding it.

Now comes the hitch. Khemi and Santu have diametrically opposite kundalis. While Khemi's kundali is supposed to make her a maanglik, Santu has an excellent kundali which makes whoever marries her prosper. In fact, much of the story is about these kundalis and their effect on the character's lives. If it had not been for her maanglik status, it would have been Khemi who would have been marrying Mahesh and his absconding on the wedding day would have resulted in her being confronted with the possibility of marrying DM (which going by her opposition to the match, she would not haver agreed to). Khemi's maanglik status had always been quoted as her bane and even now seems to be a hurdle in Hiten-Khemi union even if the tangled relationships are untangled (notwithstanding Moti's claims that Hiten has a kundali which will take care of it).

As far as Santu's kundali is concerned, DM recently proclaimed to his son that he married her for her kundali as she had a strong one.

If so much revolves around these two kundalis my question is how come Nanaji knows about the timing of birth of Kanji's baby (which could be either Santu or Khemi) to be able to draw up the kundali? He may know which child is Kanji's as there is a one year difference between the two of them. But no one seems to know when the baby was born as even Chagan and Reva seemed surprised to see Kanji and his baby. It appeared like Kanji was not in touch with them for some time and suddenly sprung up with his child. I dont think he would have handed over the birthchart also along with the baby when he left as he seemed to be in great hurry to leave.

As kundalis can give a totally different picture even if you are wrong in getting the time of birth by a few minutes, how did they draw up the kundali of the child in question? If they approximated the time, then the kundali may not be correct.

Taking into account that the Kundali won't be accurate it's probably Khemi then, because if it turns out that she isn't Santo's sis and her Kundali is wrong everyone can live happily ever after - especially Santo and DM!