How strictly is child height checked at VinWonders/Vinpearl Nha Trang, and at what height do you need an adult ticket?

A child at 142 cm (child ticket limit is 140 cm) was checked strictly at entry — staff don't eyeball it, and exceeding the limit means an adult ticket is required.

A child measured 136 cm barefoot but 138-139 cm in shoes — the question was whether staff measure with or without shoes, since it determines whether a child (up to 139 cm) or adult ticket (from 140 cm) is needed.

The zipline has a separate 140 cm minimum height requirement, regardless of age or weight. A child at 138 cm (even in shoes and a cap) may still be turned away despite being close to the limit.

One parent decided to simply buy an adult ticket for the child upfront to avoid any risk of being denied zipline access or entry due to a couple of centimeters' difference.