Mahindra & Mahindra (M&M) is set to rake in the biggest gains from the IPO of omnichannel kidswear brand FirstCry. The company is set to make almost a 6X return by selling over 28 Lakh shares of FirstCry as part of its offer for sale (OFS). M&M held a total of 5.3 Cr shares of the kids brand pre-offer.