Extended crises in which preschool audiences increase screen time and negatively affect eating habits should bring about the enforcement of stricter controls over covert advertising. This article aims to identify and analyze covert advertising for ultra-processed food brands posted by popular child YouTubers Vlad and Niki during the COVID-19 state of alarm. The method was a content analysis of 802 brands detected in 249 videos posted on the Spanish-language channel from its first broadcasting (December 2018) to January 2021. The emplacement of 102 brands (13.3%) corresponded with food products. It was found that the number of ultra-processed food brands advertised by these YouTubers increased with the COVID-19 pandemic. Posts failed to visibly and understandably reveal the YouTuber's connection with the advertiser. YouTubers expressed enthusiasm and admiration while consuming the advertised products. This puts the health of the group at risk when verifying in previous studies that there is a relationship between this type of advertising and childhood obesity.

En crisis sanitarias como la de la COVID-19, en la que aumenta el consumo de YouTube por parte de la audiencia preescolar y empeoran sus h?bitos alimenticios, resulta primordial mantener un mayor control de la publicidad que consume este p?blico en esta red social. Este art?culo tiene como prop?sito identificar y analizar la publicidad de marcas de alimentos ultraprocesados emitida por los populares youtubers infantiles Vlad y Niki durante el estado de alarma por la COVID-19. Se realiz? un an?lisis de contenido de 802 marcas detectadas en 249 v?deos publicados en el canal en espa?ol desde su apertura (diciembre de 2018) hasta enero de 2021. Se encontr? que durante la COVID-19 los youtubers promocionaron un mayor n?mero de marcas de alimentos ultraprocesados sin revelar el v?nculo con el anunciante en un lugar visible y comprensible, y que expresaron emociones positivas al consumirlos. Esto pone en riesgo la salud del colectivo al constatar en estudios previos que existe una relaci?n entre este tipo de publicidad y la obesidad infantil.