Training Underwear For Girls Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Pampers is the best-performing training underwear for girls brand in July 2026, moving 15,000 units across 2 ASINs for 35.7% of Top 10 volume. Pull-Ups follows with 10,000 units (23.8%), ahead of Herepai on 4,000 units (9.5%).

With 7 brands splitting the Top 10 and 69.0% 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 $18.99 to $49.27, 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: B08871T9QP booked 3K units at $27.94, with ▲ 0.0% MoM change. On the growth side, B0DW9C3F4L leads positive momentum with ▲ 100.0% MoM growth on 2K units, with B0FRXXNYMG close behind at ▲ 75.0% MoM on 700 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.