Urban trees are found to promote higher birth weights and support good health in newborn babies.
Dzhambov, Angel M., Donka D. Dimitrova, and Elena D. Dimitrakova. 2014."Association Between Residential Greenness and Birth Weight: Systematic Review and Meta-analysis." Urban Forestry & Urban Greening 13 (2014): 621-29. Elsevier. Web. 12 January 2016.