Potential best-selling maternal and baby products during 618

In a 618 (June 18th sale event in China) without a “presale system,” for sellers, it means the absence of reference data. They must have a stronger inventory management ability and the capability to forecast market demand to avoid stockpiling or stockouts of goods.
So, in this year’s unique 618 shopping festival, which maternal and baby products can stand out and achieve both popularity and sales?