Vitamin D can be supplemented to the suckling pig in synthetic forms; however, this increases production and labor cost. Goff et al. (1984) reported increased piglet serum 25(OH)D3 concentrations in newborn pigs from sows dosed with vitamin D3 intramuscularly, indicating that vitamin D and its metabolites are transferred transplacentally. No research has examined the influence of maternal dietary vitamin D3 on vitamin D status of young pigs (measured by serum 25(OH)D3), which would represent a less expensive and less labor intensive form of supplement for the young pig. The objectives of this experiment were to evaluate whether increasing vitamin D status through maternal vitamin D3 supplementation (2, 4, and 8 times requirement; NRC, 2012) affects maternal performance, milk vitamin D3 concentrations, sow and piglet serum 25(OH)D3 concentrations, subsequent pig growth, neonatal pig liver and kidney vitamin D3 concentrations, and neonatal bone mineralization.