Diapers Size 2 Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

HUGGIES is the best-performing diapers size 2 brand in July 2026, moving 88,000 units across 6 ASINs for 71.0% of Top 10 volume. Pampers follows with 36,000 units (29.0%).

With 2 brands splitting the Top 10 and 100.0% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $27.01 to $27.07, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B0DFNRLHVY booked 7K units at $8.94, with ▲ 75.0% MoM change. On the growth side, B0GDZ42VY8 leads positive momentum with ▲ 200.0% MoM growth on 600 units, with B0BMF3XTCB close behind at ▲ 100.0% MoM on 2K units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.