A top official of the UN children's agency says more than 40 million people in Pakistan do not have access to a toilet, forcing them to defecate in the open.
As a result, Geeta Rao Gupta, deputy executive director at UNICEF, said many in Pakistan were at risk of "significant health and nutritional consequences."
Pakistan is the third-largest country when it comes to people going to the bathroom in the open, behind India and Indonesia.
Speaking to the AP, Gupta explained the problem can spread disease and lead to intestinal infections, which can contribute to stunting in young children.
Stunting means children don't grow as tall as they would otherwise, and it can also affect a child's brain development.
Stunted children are more at risk of disease, don't do as well in school and stunted mothers can also give birth to stunted children.