Can too many hours in front of a screen have an effect on a child’s well-being?

The research “Early Childhood Electronic Media Use as a Predictor of Poorer Well-being” by Hinkley et al. including Professor Lucia Reisch from CBS Centre for Corporate Social Responsibility (cbsCSR) has recently been featured in The Huffington Post and Fox News, respectively. The two articles discuss through different researches if there is a connection between how many hours a child spent watching TV or playing electronic games and a child's well-being. 
Read the article from The Huffington Post here.
Reas the article from Fox News here.