Over 800,000 children under the age of 5 could be saved each year if more women breastfed.
The disease is a so-called "known unknown" that could be created by biological mutation in the future.
The danger hinges on how much gaming interferes with life.
The report also found that health care expenses are pushing hundreds of millions of people into poverty.
One in 10 medications in poor countries are fake, World Health Organization finds.
The infants missed out on the first dose of a combined vaccine against three possibly fatal diseases.
Some public health experts fear that losing the "international emergency" label could slow research into the virus.
The World Health Organization said infertility should not be regarded as simply a medical condition.
More than 200 health experts wrote an open letter in May calling for the games to be postponed or relocated because of the Zika outbreak.
Diabetes has exploded in developing countries as poor workers go from hard labor to "sedentary lifestyles."
The virus is back, one day after the WHO declared active transmission had ended.
The organization did not declare the virus to be a global emergency until five months after outbreaks were reported.