WorldPop Africa pregnancies dataset details 
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DATASET: Alpha version 2010, 2012, 2015, 2020, 2025, 2030, and 2035 estimates of numbers of pregnancies per grid square, with national totals adjusted to match national estimates on numbers of pregnancies made by the Guttmacher Institute (http://www.guttmacher.org/).  
REGION: Africa 
SPATIAL RESOLUTION: 0.000833333 decimal degrees (approx 100m at the equator) 
PROJECTION: Geographic, WGS84 
UNITS: Estimated pregnancies per grid square 
MAPPING APPROACH: Tatem AJ, Campbell J, Guerra-Arias M, de Bernis L, Moran A, Matthews Z, 2014, Mapping for maternal and newborn health: the distributions of women of childbearing age, pregnancies and births, International Journal of Health Geographics, 13:2 
FORMAT: Geotiff (zipped using 7-zip (open access tool): www.7-zip.org) 
FILENAMES: Example - BEN2010pregnancies.tif = Benin (BEN) pregnancies count map for 2010 adjusted to match UN national estimates on numbers of pregnancies. 
DATE OF PRODUCTION: May 2014 

Dataset construction details and input data are provided here: http://www.worldpop.org.uk/data/methods/
The births mapping approach is described here: http://www.ij-healthgeographics.com/content/13/1/2