Before her death, Naira remembered that she was an infertile girl and had a lot of pain because of it and therefore another girl shouldn't suffer like her therefore she donated her eggs without telling Kartik. Swarna was aware and post death he kept the eggs safe for future. Later Sirat tells him that she is infertile and MG gives her Naira's eggs and she ended up being surrogate for Kaira. The child Aarohi was biologically Naira's but only Sirat, Kartik and Swarna knew. Aarohi was like her bio mom (paidaish wins) and Akshu was like her adopted mom (parvarish wins) but their daughters became like their maasis instead of moms.
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